Merge branch 'develop' of github.com:matrix-org/matrix-react-sdk into joriks/room-list-auto-expand-on-search

2020-07-09 17:14:52 +01:00 · 2020-07-09 17:14:52 +01:00 · 9b79de7fe7
commit 9b79de7fe7
parent bb18e677f9 d94b6e2b36
63 changed files with 2300 additions and 799 deletions
--- a/package.json
+++ b/package.json
@ -89,11 +89,11 @@
    "prop-types": "^15.5.8",
    "qrcode": "^1.4.4",
    "qs": "^6.6.0",
+    "re-resizable": "^6.5.2",
    "react": "^16.9.0",
    "react-beautiful-dnd": "^4.0.1",
    "react-dom": "^16.9.0",
    "react-focus-lock": "^2.2.1",
-    "react-resizable": "^1.10.1",
    "react-transition-group": "^4.4.1",
    "resize-observer-polyfill": "^1.5.0",
    "sanitize-html": "^1.18.4",
@ -122,6 +122,7 @@
    "@types/classnames": "^2.2.10",
    "@types/counterpart": "^0.18.1",
    "@types/flux": "^3.1.9",
+    "@types/linkifyjs": "^2.1.3",
    "@types/lodash": "^4.14.152",
    "@types/modernizr": "^3.5.3",
    "@types/node": "^12.12.41",
@ -129,6 +130,7 @@
    "@types/react": "^16.9",
    "@types/react-dom": "^16.9.8",
    "@types/react-transition-group": "^4.4.0",
+    "@types/sanitize-html": "^1.23.3",
    "@types/zxcvbn": "^4.4.0",
    "babel-eslint": "^10.0.3",
    "babel-jest": "^24.9.0",
--- a/res/css/_components.scss
+++ b/res/css/_components.scss
@ -51,6 +51,7 @@
@import "./views/avatars/_BaseAvatar.scss";
@import "./views/avatars/_DecoratedRoomAvatar.scss";
@import "./views/avatars/_MemberStatusMessageAvatar.scss";
+@import "./views/avatars/_PulsedAvatar.scss";
@import "./views/context_menus/_MessageContextMenu.scss";
@import "./views/context_menus/_RoomTileContextMenu.scss";
@import "./views/context_menus/_StatusMessageContextMenu.scss";
@ -225,6 +226,8 @@
@import "./views/settings/tabs/user/_VoiceUserSettingsTab.scss";
@import "./views/terms/_InlineTermsAgreement.scss";
@import "./views/verification/_VerificationShowSas.scss";
+@import "./views/voip/_CallContainer.scss";
@import "./views/voip/_CallView.scss";
+@import "./views/voip/_CallView2.scss";
@import "./views/voip/_IncomingCallbox.scss";
@import "./views/voip/_VideoView.scss";
--- a/res/css/structures/_LeftPanel2.scss
+++ b/res/css/structures/_LeftPanel2.scss
@ -121,6 +121,24 @@ $tagPanelWidth: 70px; // only applies in this file, used for calculations
            }
        }

+        .mx_LeftPanel2_roomListWrapper {
+            // Create a flexbox to ensure the containing items cause appropriate overflow.
+            display: flex;
+
+            flex-grow: 1;
+            overflow: hidden;
+            min-height: 0;
+            margin-top: 12px; // so we're not up against the search/filter
+
+            &.mx_LeftPanel2_roomListWrapper_stickyBottom {
+                padding-bottom: 32px;
+            }
+
+            &.mx_LeftPanel2_roomListWrapper_stickyTop {
+                padding-top: 32px;
+            }
+        }
+
        .mx_LeftPanel2_actualRoomListContainer {
            flex-grow: 1; // fill the available space
            overflow-y: auto;
--- a/res/css/views/avatars/_PulsedAvatar.scss
+++ b/res/css/views/avatars/_PulsedAvatar.scss
@ -0,0 +1,30 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_PulsedAvatar {
+    @keyframes shadow-pulse {
+        0% {
+            box-shadow: 0 0 0 0px rgba($accent-color, 0.2);
+        }
+        100% {
+            box-shadow: 0 0 0 6px rgba($accent-color, 0);
+        }
+    }
+
+    img {
+        animation: shadow-pulse 1s infinite;
+    }
+}
--- a/res/css/views/rooms/_JumpToBottomButton.scss
+++ b/res/css/views/rooms/_JumpToBottomButton.scss
@ -41,6 +41,11 @@ limitations under the License.
    // with text-align in parent
    display: inline-block;
    padding: 0 4px;
+    color: $roomtile-badge-fg-color;
+    background-color: $roomtile-name-color;
+}
+
+.mx_JumpToBottomButton_highlight .mx_JumpToBottomButton_badge {
    color: $secondary-accent-color;
    background-color: $warning-color;
 }
--- a/res/css/views/rooms/_RoomSublist2.scss
+++ b/res/css/views/rooms/_RoomSublist2.scss
@ -24,10 +24,6 @@ limitations under the License.
    margin-left: 8px;
    width: 100%;

-    &:first-child {
-        margin-top: 12px; // so we're not up against the search/filter
-    }
-
    .mx_RoomSublist2_headerContainer {
        // Create a flexbox to make alignment easy
        display: flex;
@ -49,13 +45,15 @@ limitations under the License.
        padding-bottom: 8px;
        height: 24px;

+        // Hide the header container if the contained element is stickied.
+        // We don't use display:none as that causes the header to go away too.
+        &.mx_RoomSublist2_headerContainer_hasSticky {
+            height: 0;
+        }
+
        .mx_RoomSublist2_stickable {
            flex: 1;
            max-width: 100%;
-            z-index: 2; // Prioritize headers in the visible list over sticky ones
-
-            // Set the same background color as the room list for sticky headers
-            background-color: $roomlist2-bg-color;

            // Create a flexbox to make ordering easy
            display: flex;
@ -67,7 +65,6 @@ limitations under the License.
            // when sticky scrolls instead of collapses the list.
            &.mx_RoomSublist2_headerContainer_sticky {
                position: fixed;
-                z-index: 1; // over top of other elements, but still under the ones in the visible list
                height: 32px; // to match the header container
                // width set by JS
            }
@ -190,28 +187,29 @@ limitations under the License.
        flex-direction: column;
        overflow: hidden;

+        .mx_RoomSublist2_placeholder {
+            height: 44px; // Height of a room tile plus margins
+        }
+
        .mx_RoomSublist2_showNButton {
            cursor: pointer;
            font-size: $font-13px;
            line-height: $font-18px;
            color: $roomtile2-preview-color;

-            // This is the same color as the left panel background because it needs
-            // to occlude the lastmost tile in the list.
-            background-color: $roomlist2-bg-color;
-
            // Update the render() function for RoomSublist2 if these change
            // Update the ListLayout class for minVisibleTiles if these change.
            //
-            // At 24px high and 8px padding on the top this equates to 0.65 of
+            // At 24px high, 8px padding on the top and 4px padding on the bottom  this equates to 0.73 of
            // a tile due to how the padding calculations work.
            height: 24px;
            padding-top: 8px;
+            padding-bottom: 4px;

            // We force this to the bottom so it will overlap rooms as needed.
            // We account for the space it takes up (24px) in the code through padding.
            position: absolute;
-            bottom: 4px; // the height of the resize handle
+            bottom: 0;
            left: 0;
            right: 0;

@ -238,39 +236,31 @@ limitations under the License.
            .mx_RoomSublist2_showLessButtonChevron {
                mask-image: url('$(res)/img/feather-customised/chevron-up.svg');
            }
-
-            &.mx_RoomSublist2_isCutting::before {
-                content: '';
-                position: absolute;
-                top: 0;
-                left: 0;
-                right: 0;
-                height: 4px;
-                box-shadow: 0px -2px 3px rgba(46, 47, 50, 0.08);
-            }
        }

        // Class name comes from the ResizableBox component
        // The hover state needs to use the whole sublist, not just the resizable box,
        // so that selector is below and one level higher.
-        .react-resizable-handle {
+        .mx_RoomSublist2_resizerHandle {
            cursor: ns-resize;
            border-radius: 3px;

-            // Update RESIZE_HANDLE_HEIGHT if this changes
-            height: 4px;
+            // Override styles from library
+            width: unset !important;
+            height: 4px !important; // Update RESIZE_HANDLE_HEIGHT if this changes

            // This is positioned directly below the 'show more' button.
            position: absolute;
-            bottom: 0;
+            bottom: 0 !important; // override from library

            // Together, these make the bar 64px wide
-            left: calc(50% - 32px);
-            right: calc(50% - 32px);
+            // These are also overridden from the library
+            left: calc(50% - 32px) !important;
+            right: calc(50% - 32px) !important;
        }

        &:hover, &.mx_RoomSublist2_hasMenuOpen {
-            .react-resizable-handle {
+            .mx_RoomSublist2_resizerHandle {
                opacity: 0.8;
                background-color: $primary-fg-color;
            }
--- a/res/css/views/rooms/_RoomTile2.scss
+++ b/res/css/views/rooms/_RoomTile2.scss
@ -21,6 +21,10 @@ limitations under the License.
    margin-bottom: 4px;
    padding: 4px;

+    // allow scrollIntoView to ignore the sticky headers, must match combined height of .mx_RoomSublist2_headerContainer
+    scroll-margin-top: 32px;
+    scroll-margin-bottom: 32px;
+
    // The tile is also a flexbox row itself
    display: flex;

@ -165,6 +169,11 @@ limitations under the License.
    }
 }

+// do not apply scroll-margin-bottom to the sublist which will not have a sticky header below it
+.mx_RoomSublist2:last-child .mx_RoomTile2 {
+    scroll-margin-bottom: 0;
+}
+
 // We use these both in context menus and the room tiles
 .mx_RoomTile2_iconBell::before {
    mask-image: url('$(res)/img/feather-customised/bell.svg');
@ -224,6 +233,10 @@ limitations under the License.
        mask-image: url('$(res)/img/feather-customised/star.svg');
    }

+    .mx_RoomTile2_iconFavorite::before {
+        mask-image: url('$(res)/img/feather-customised/favourites.svg');
+    }
+
    .mx_RoomTile2_iconArrowDown::before {
        mask-image: url('$(res)/img/feather-customised/arrow-down.svg');
    }
--- a/res/css/views/voip/_CallContainer.scss
+++ b/res/css/views/voip/_CallContainer.scss
@ -0,0 +1,89 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_CallContainer {
+    position: absolute;
+    right: 20px;
+    bottom: 72px;
+    border-radius: 8px;
+    overflow: hidden;
+    z-index: 100;
+    box-shadow: 0px 14px 24px rgba(0, 0, 0, 0.08);
+
+    cursor: pointer;
+
+    .mx_CallPreview {
+        .mx_VideoView {
+            width: 350px;
+        }
+
+        .mx_VideoView_localVideoFeed {
+            border-radius: 8px;
+            overflow: hidden;
+        }
+    }
+
+    .mx_IncomingCallBox2 {
+        min-width: 250px;
+        background-color: $primary-bg-color;
+        padding: 8px;
+
+        .mx_IncomingCallBox2_CallerInfo {
+            display: flex;
+            direction: row;
+
+            img {
+                margin: 8px;
+            }
+
+            > div {
+                display: flex;
+                flex-direction: column;
+
+                justify-content: center;
+            }
+
+            h1, p {
+                margin: 0px;
+                padding: 0px;
+                font-size: $font-14px;
+                line-height: $font-16px;
+            }
+
+            h1 {
+                font-weight: bold;
+            }
+        }
+
+        .mx_IncomingCallBox2_buttons {
+            padding: 8px;
+            display: flex;
+            flex-direction: row;
+
+            > .mx_IncomingCallBox2_spacer {
+                width: 8px;
+            }
+
+            > * {
+                flex-shrink: 0;
+                flex-grow: 1;
+                margin-right: 0;
+                font-size: $font-15px;
+                line-height: $font-24px;
+            }
+        }
+    }
+}
--- a/res/css/views/voip/_CallView2.scss
+++ b/res/css/views/voip/_CallView2.scss
@ -0,0 +1,96 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
+
+.mx_CallView2_voice {
+    background-color: $accent-color;
+    color: $accent-fg-color;
+    cursor: pointer;
+    padding: 6px;
+    font-weight: bold;
+
+    border-radius: 8px;
+    min-width: 200px;
+
+    display: flex;
+    align-items: center;
+
+    img {
+        margin: 4px;
+        margin-right: 10px;
+    }
+
+    > div {
+        display: flex;
+        flex-direction: column;
+        // Hacky vertical align
+        padding-top: 3px;
+    }
+
+    > div > p,
+    > div > h1 {
+        padding: 0;
+        margin: 0;
+        font-size: $font-13px;
+        line-height: $font-15px;
+    }
+
+    > div > p {
+        font-weight: bold;
+    }
+
+    > * {
+        flex-grow: 0;
+        flex-shrink: 0;
+    }
+}
+
+.mx_CallView2_hangup {
+    position: absolute;
+
+    right: 8px;
+    bottom: 10px;
+
+    height: 35px;
+    width: 35px;
+
+    border-radius: 35px;
+
+    background-color: $notice-primary-color;
+
+    z-index: 101;
+
+    cursor: pointer;
+
+    &::before {
+        content: '';
+        position: absolute;
+
+        height: 20px;
+        width: 20px;
+
+        top: 6.5px;
+        left: 7.5px;
+
+        mask: url('$(res)/img/hangup.svg');
+        mask-size: contain;
+        background-size: contain;
+
+        background-color: $primary-fg-color;
+    }
+}
--- a/res/img/feather-customised/favourites.svg
+++ b/res/img/feather-customised/favourites.svg
@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7.41411 0.432179C7.59217 -0.144061 8.40783 -0.144059 8.58589 0.43218L10.1715 5.56319H15.3856C15.9721 5.56319 16.224 6.30764 15.7578 6.66373L11.5135 9.90611L13.1185 15.1001C13.2948 15.6705 12.6348 16.1309 12.1604 15.7684L8 12.5902L3.83965 15.7684C3.3652 16.1309 2.70521 15.6705 2.88148 15.1001L4.4865 9.90611L0.242159 6.66373C-0.223967 6.30764 0.0278507 5.56319 0.614427 5.56319H5.82854L7.41411 0.432179Z" fill="black"/>
+</svg>
--- a/src/@types/common.ts
+++ b/src/@types/common.ts
@ -17,3 +17,4 @@ limitations under the License.
 // Based on https://stackoverflow.com/a/53229857/3532235
 export type Without<T, U> = {[P in Exclude<keyof T, keyof U>] ? : never};
 export type XOR<T, U> = (T | U) extends object ? (Without<T, U> & U) | (Without<U, T> & T) : T | U;
+export type Writeable<T> = { -readonly [P in keyof T]: T[P] };
--- a/src/@types/global.d.ts
+++ b/src/@types/global.d.ts
@ -21,6 +21,7 @@ import ToastStore from "../stores/ToastStore";
 import DeviceListener from "../DeviceListener";
 import { RoomListStore2 } from "../stores/room-list/RoomListStore2";
 import { PlatformPeg } from "../PlatformPeg";
+import RoomListLayoutStore from "../stores/room-list/RoomListLayoutStore";

 declare global {
    interface Window {
@ -34,6 +35,7 @@ declare global {
        mx_ToastStore: ToastStore;
        mx_DeviceListener: DeviceListener;
        mx_RoomListStore2: RoomListStore2;
+        mx_RoomListLayoutStore: RoomListLayoutStore;
        mxPlatformPeg: PlatformPeg;
    }

--- a/src/@types/polyfill.ts
+++ b/src/@types/polyfill.ts
@ -0,0 +1,38 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// This is intended to fix re-resizer because of its unguarded `instanceof TouchEvent` checks.
+export function polyfillTouchEvent() {
+    // Firefox doesn't have touch events without touch devices being present, so create a fake
+    // one we can rely on lying about.
+    if (!window.TouchEvent) {
+        // We have no intention of actually using this, so just lie.
+        window.TouchEvent = class TouchEvent extends UIEvent {
+            public get altKey(): boolean { return false; }
+            public get changedTouches(): any { return []; }
+            public get ctrlKey(): boolean { return false; }
+            public get metaKey(): boolean { return false; }
+            public get shiftKey(): boolean { return false; }
+            public get targetTouches(): any { return []; }
+            public get touches(): any { return []; }
+            public get rotation(): number { return 0.0; }
+            public get scale(): number { return 0.0; }
+            constructor(eventType: string, params?: any) {
+                super(eventType, params);
+            }
+        };
+    }
+}
--- a/src/HtmlUtils.tsx
+++ b/src/HtmlUtils.tsx
@ -17,10 +17,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-'use strict';
-
-import ReplyThread from "./components/views/elements/ReplyThread";
-
 import React from 'react';
 import sanitizeHtml from 'sanitize-html';
 import * as linkify from 'linkifyjs';
@ -28,12 +24,13 @@ import linkifyMatrix from './linkify-matrix';
 import _linkifyElement from 'linkifyjs/element';
 import _linkifyString from 'linkifyjs/string';
 import classNames from 'classnames';
-import {MatrixClientPeg} from './MatrixClientPeg';
+import EMOJIBASE_REGEX from 'emojibase-regex';
 import url from 'url';

-import EMOJIBASE_REGEX from 'emojibase-regex';
+import {MatrixClientPeg} from './MatrixClientPeg';
 import {tryTransformPermalinkToLocalHref} from "./utils/permalinks/Permalinks";
 import {SHORTCODE_TO_EMOJI, getEmojiFromUnicode} from "./emoji";
+import ReplyThread from "./components/views/elements/ReplyThread";

 linkifyMatrix(linkify);

@ -64,7 +61,7 @@ const PERMITTED_URL_SCHEMES = ['http', 'https', 'ftp', 'mailto', 'magnet'];
 * need emojification.
 * unicodeToImage uses this function.
 */
-function mightContainEmoji(str) {
+function mightContainEmoji(str: string) {
    return SURROGATE_PAIR_PATTERN.test(str) || SYMBOL_PATTERN.test(str);
 }

@ -74,7 +71,7 @@ function mightContainEmoji(str) {
 * @param {String} char The emoji character
 * @return {String} The shortcode (such as :thumbup:)
 */
-export function unicodeToShortcode(char) {
+export function unicodeToShortcode(char: string) {
    const data = getEmojiFromUnicode(char);
    return (data && data.shortcodes ? `:${data.shortcodes[0]}:` : '');
 }
@ -85,7 +82,7 @@ export function unicodeToShortcode(char) {
 * @param {String} shortcode The shortcode (such as :thumbup:)
 * @return {String} The emoji character; null if none exists
 */
-export function shortcodeToUnicode(shortcode) {
+export function shortcodeToUnicode(shortcode: string) {
    shortcode = shortcode.slice(1, shortcode.length - 1);
    const data = SHORTCODE_TO_EMOJI.get(shortcode);
    return data ? data.unicode : null;
@ -100,7 +97,7 @@ export function processHtmlForSending(html: string): string {
    }

    let contentHTML = "";
-    for (let i=0; i < contentDiv.children.length; i++) {
+    for (let i = 0; i < contentDiv.children.length; i++) {
        const element = contentDiv.children[i];
        if (element.tagName.toLowerCase() === 'p') {
            contentHTML += element.innerHTML;
@ -122,12 +119,19 @@ export function processHtmlForSending(html: string): string {
 * Given an untrusted HTML string, return a React node with an sanitized version
 * of that HTML.
 */
-export function sanitizedHtmlNode(insaneHtml) {
+export function sanitizedHtmlNode(insaneHtml: string) {
    const saneHtml = sanitizeHtml(insaneHtml, sanitizeHtmlParams);

    return <div dangerouslySetInnerHTML={{ __html: saneHtml }} dir="auto" />;
 }

+export function sanitizedHtmlNodeInnerText(insaneHtml: string) {
+    const saneHtml = sanitizeHtml(insaneHtml, sanitizeHtmlParams);
+    const contentDiv = document.createElement("div");
+    contentDiv.innerHTML = saneHtml;
+    return contentDiv.innerText;
+}
+
 /**
 * Tests if a URL from an untrusted source may be safely put into the DOM
 * The biggest threat here is javascript: URIs.
@ -136,7 +140,7 @@ export function sanitizedHtmlNode(insaneHtml) {
 * other places we need to sanitise URLs.
 * @return true if permitted, otherwise false
 */
-export function isUrlPermitted(inputUrl) {
+export function isUrlPermitted(inputUrl: string) {
    try {
        const parsed = url.parse(inputUrl);
        if (!parsed.protocol) return false;
@ -147,9 +151,9 @@ export function isUrlPermitted(inputUrl) {
    }
 }

-const transformTags = { // custom to matrix
+const transformTags: sanitizeHtml.IOptions["transformTags"] = { // custom to matrix
    // add blank targets to all hyperlinks except vector URLs
-    'a': function(tagName, attribs) {
+    'a': function(tagName: string, attribs: sanitizeHtml.Attributes) {
        if (attribs.href) {
            attribs.target = '_blank'; // by default

@ -162,7 +166,7 @@ const transformTags = { // custom to matrix
        attribs.rel = 'noreferrer noopener'; // https://mathiasbynens.github.io/rel-noopener/
        return { tagName, attribs };
    },
-    'img': function(tagName, attribs) {
+    'img': function(tagName: string, attribs: sanitizeHtml.Attributes) {
        // Strip out imgs that aren't `mxc` here instead of using allowedSchemesByTag
        // because transformTags is used _before_ we filter by allowedSchemesByTag and
        // we don't want to allow images with `https?` `src`s.
@ -176,7 +180,7 @@ const transformTags = { // custom to matrix
        );
        return { tagName, attribs };
    },
-    'code': function(tagName, attribs) {
+    'code': function(tagName: string, attribs: sanitizeHtml.Attributes) {
        if (typeof attribs.class !== 'undefined') {
            // Filter out all classes other than ones starting with language- for syntax highlighting.
            const classes = attribs.class.split(/\s/).filter(function(cl) {
@ -186,7 +190,7 @@ const transformTags = { // custom to matrix
        }
        return { tagName, attribs };
    },
-    '*': function(tagName, attribs) {
+    '*': function(tagName: string, attribs: sanitizeHtml.Attributes) {
        // Delete any style previously assigned, style is an allowedTag for font and span
        // because attributes are stripped after transforming
        delete attribs.style;
@ -220,7 +224,7 @@ const transformTags = { // custom to matrix
    },
 };

-const sanitizeHtmlParams = {
+const sanitizeHtmlParams: sanitizeHtml.IOptions = {
    allowedTags: [
        'font', // custom to matrix for IRC-style font coloring
        'del', // for markdown
@ -247,16 +251,16 @@ const sanitizeHtmlParams = {
 };

 // this is the same as the above except with less rewriting
-const composerSanitizeHtmlParams = Object.assign({}, sanitizeHtmlParams);
-composerSanitizeHtmlParams.transformTags = {
+const composerSanitizeHtmlParams: sanitizeHtml.IOptions = {
+    ...sanitizeHtmlParams,
+    transformTags: {
        'code': transformTags['code'],
        '*': transformTags['*'],
+    },
 };

-class BaseHighlighter {
-    constructor(highlightClass, highlightLink) {
-        this.highlightClass = highlightClass;
-        this.highlightLink = highlightLink;
+abstract class BaseHighlighter<T extends React.ReactNode> {
+    constructor(public highlightClass: string, public highlightLink: string) {
    }

    /**
@ -270,47 +274,49 @@ class BaseHighlighter {
     * returns a list of results (strings for HtmlHighligher, react nodes for
     * TextHighlighter).
     */
-    applyHighlights(safeSnippet, safeHighlights) {
+    public applyHighlights(safeSnippet: string, safeHighlights: string[]): T[] {
        let lastOffset = 0;
        let offset;
-        let nodes = [];
+        let nodes: T[] = [];

        const safeHighlight = safeHighlights[0];
        while ((offset = safeSnippet.toLowerCase().indexOf(safeHighlight.toLowerCase(), lastOffset)) >= 0) {
            // handle preamble
            if (offset > lastOffset) {
-                var subSnippet = safeSnippet.substring(lastOffset, offset);
-                nodes = nodes.concat(this._applySubHighlights(subSnippet, safeHighlights));
+                const subSnippet = safeSnippet.substring(lastOffset, offset);
+                nodes = nodes.concat(this.applySubHighlights(subSnippet, safeHighlights));
            }

            // do highlight. use the original string rather than safeHighlight
            // to preserve the original casing.
            const endOffset = offset + safeHighlight.length;
-            nodes.push(this._processSnippet(safeSnippet.substring(offset, endOffset), true));
+            nodes.push(this.processSnippet(safeSnippet.substring(offset, endOffset), true));

            lastOffset = endOffset;
        }

        // handle postamble
        if (lastOffset !== safeSnippet.length) {
-            subSnippet = safeSnippet.substring(lastOffset, undefined);
-            nodes = nodes.concat(this._applySubHighlights(subSnippet, safeHighlights));
+            const subSnippet = safeSnippet.substring(lastOffset, undefined);
+            nodes = nodes.concat(this.applySubHighlights(subSnippet, safeHighlights));
        }
        return nodes;
    }

-    _applySubHighlights(safeSnippet, safeHighlights) {
+    private applySubHighlights(safeSnippet: string, safeHighlights: string[]): T[] {
        if (safeHighlights[1]) {
            // recurse into this range to check for the next set of highlight matches
            return this.applyHighlights(safeSnippet, safeHighlights.slice(1));
        } else {
            // no more highlights to be found, just return the unhighlighted string
-            return [this._processSnippet(safeSnippet, false)];
+            return [this.processSnippet(safeSnippet, false)];
        }
    }
+
+    protected abstract processSnippet(snippet: string, highlight: boolean): T;
 }

-class HtmlHighlighter extends BaseHighlighter {
+class HtmlHighlighter extends BaseHighlighter<string> {
    /* highlight the given snippet if required
     *
     * snippet: content of the span; must have been sanitised
@ -318,28 +324,23 @@ class HtmlHighlighter extends BaseHighlighter {
     *
     * returns an HTML string
     */
-    _processSnippet(snippet, highlight) {
+    protected processSnippet(snippet: string, highlight: boolean): string {
        if (!highlight) {
            // nothing required here
            return snippet;
        }

-        let span = "<span class=\""+this.highlightClass+"\">"
-            + snippet + "</span>";
+        let span = `<span class="${this.highlightClass}">${snippet}</span>`;

        if (this.highlightLink) {
-            span = "<a href=\""+encodeURI(this.highlightLink)+"\">"
-                +span+"</a>";
+            span = `<a href="${encodeURI(this.highlightLink)}">${span}</a>`;
        }
        return span;
    }
 }

-class TextHighlighter extends BaseHighlighter {
-    constructor(highlightClass, highlightLink) {
-        super(highlightClass, highlightLink);
-        this._key = 0;
-    }
+class TextHighlighter extends BaseHighlighter<React.ReactNode> {
+    private key = 0;

    /* create a <span> node to hold the given content
     *
@ -348,11 +349,10 @@ class TextHighlighter extends BaseHighlighter {
     *
     * returns a React node
     */
-    _processSnippet(snippet, highlight) {
-        const key = this._key++;
+    protected processSnippet(snippet: string, highlight: boolean): React.ReactNode {
+        const key = this.key++;

-        let node =
-            <span key={key} className={highlight ? this.highlightClass : null}>
+        let node = <span key={key} className={highlight ? this.highlightClass : null}>
            { snippet }
        </span>;

@ -364,6 +364,20 @@ class TextHighlighter extends BaseHighlighter {
    }
 }

+interface IContent {
+    format?: string;
+    formatted_body?: string;
+    body: string;
+}
+
+interface IOpts {
+    highlightLink?: string;
+    disableBigEmoji?: boolean;
+    stripReplyFallback?: boolean;
+    returnString?: boolean;
+    forComposerQuote?: boolean;
+    ref?: React.Ref<any>;
+}

 /* turn a matrix event body into html
 *
@ -378,7 +392,7 @@ class TextHighlighter extends BaseHighlighter {
 * opts.forComposerQuote: optional param to lessen the url rewriting done by sanitization, for quoting into composer
 * opts.ref: React ref to attach to any React components returned (not compatible with opts.returnString)
 */
-export function bodyToHtml(content, highlights, opts={}) {
+export function bodyToHtml(content: IContent, highlights: string[], opts: IOpts = {}) {
    const isHtmlMessage = content.format === "org.matrix.custom.html" && content.formatted_body;
    let bodyHasEmoji = false;

@ -387,9 +401,9 @@ export function bodyToHtml(content, highlights, opts={}) {
        sanitizeParams = composerSanitizeHtmlParams;
    }

-    let strippedBody;
-    let safeBody;
-    let isDisplayedWithHtml;
+    let strippedBody: string;
+    let safeBody: string;
+    let isDisplayedWithHtml: boolean;
    // XXX: We sanitize the HTML whilst also highlighting its text nodes, to avoid accidentally trying
    // to highlight HTML tags themselves.  However, this does mean that we don't highlight textnodes which
    // are interrupted by HTML tags (not that we did before) - e.g. foo<span/>bar won't get highlighted
@ -471,7 +485,7 @@ export function bodyToHtml(content, highlights, opts={}) {
 * @param {object} [options] Options for linkifyString. Default: linkifyMatrix.options
 * @returns {string} Linkified string
 */
-export function linkifyString(str, options = linkifyMatrix.options) {
+export function linkifyString(str: string, options = linkifyMatrix.options) {
    return _linkifyString(str, options);
 }

@ -482,7 +496,7 @@ export function linkifyString(str, options = linkifyMatrix.options) {
 * @param {object} [options] Options for linkifyElement. Default: linkifyMatrix.options
 * @returns {object}
 */
-export function linkifyElement(element, options = linkifyMatrix.options) {
+export function linkifyElement(element: HTMLElement, options = linkifyMatrix.options) {
    return _linkifyElement(element, options);
 }

@ -493,7 +507,7 @@ export function linkifyElement(element, options = linkifyMatrix.options) {
 * @param {object} [options] Options for linkifyString. Default: linkifyMatrix.options
 * @returns {string}
 */
-export function linkifyAndSanitizeHtml(dirtyHtml, options = linkifyMatrix.options) {
+export function linkifyAndSanitizeHtml(dirtyHtml: string, options = linkifyMatrix.options) {
    return sanitizeHtml(linkifyString(dirtyHtml, options), sanitizeHtmlParams);
 }

@ -504,7 +518,7 @@ export function linkifyAndSanitizeHtml(dirtyHtml, options = linkifyMatrix.option
 * @param {Node} node
 * @returns {bool}
 */
-export function checkBlockNode(node) {
+export function checkBlockNode(node: Node) {
    switch (node.nodeName) {
        case "H1":
        case "H2":
--- a/src/accessibility/context_menu/ContextMenuButton.tsx
+++ b/src/accessibility/context_menu/ContextMenuButton.tsx
@ -0,0 +1,51 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import AccessibleButton, {IProps as IAccessibleButtonProps} from "../../components/views/elements/AccessibleButton";
+
+interface IProps extends IAccessibleButtonProps {
+    label?: string;
+    // whether or not the context menu is currently open
+    isExpanded: boolean;
+}
+
+// Semantic component for representing the AccessibleButton which launches a <ContextMenu />
+export const ContextMenuButton: React.FC<IProps> = ({
+    label,
+    isExpanded,
+    children,
+    onClick,
+    onContextMenu,
+    ...props
+}) => {
+    return (
+        <AccessibleButton
+            {...props}
+            onClick={onClick}
+            onContextMenu={onContextMenu || onClick}
+            title={label}
+            aria-label={label}
+            aria-haspopup={true}
+            aria-expanded={isExpanded}
+        >
+            { children }
+        </AccessibleButton>
+    );
+};
--- a/src/accessibility/context_menu/MenuGroup.tsx
+++ b/src/accessibility/context_menu/MenuGroup.tsx
@ -0,0 +1,30 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+interface IProps extends React.HTMLAttributes<HTMLDivElement> {
+    label: string;
+}
+
+// Semantic component for representing a role=group for grouping menu radios/checkboxes
+export const MenuGroup: React.FC<IProps> = ({children, label, ...props}) => {
+    return <div {...props} role="group" aria-label={label}>
+        { children }
+    </div>;
+};
--- a/src/accessibility/context_menu/MenuItem.tsx
+++ b/src/accessibility/context_menu/MenuItem.tsx
@ -0,0 +1,35 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import AccessibleButton from "../../components/views/elements/AccessibleButton";
+
+interface IProps extends React.ComponentProps<typeof AccessibleButton> {
+    label?: string;
+}
+
+// Semantic component for representing a role=menuitem
+export const MenuItem: React.FC<IProps> = ({children, label, ...props}) => {
+    return (
+        <AccessibleButton {...props} role="menuitem" tabIndex={-1} aria-label={label}>
+            { children }
+        </AccessibleButton>
+    );
+};
+
--- a/src/accessibility/context_menu/MenuItemCheckbox.tsx
+++ b/src/accessibility/context_menu/MenuItemCheckbox.tsx
@ -0,0 +1,43 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import AccessibleButton from "../../components/views/elements/AccessibleButton";
+
+interface IProps extends React.ComponentProps<typeof AccessibleButton> {
+    label?: string;
+    active: boolean;
+}
+
+// Semantic component for representing a role=menuitemcheckbox
+export const MenuItemCheckbox: React.FC<IProps> = ({children, label, active, disabled, ...props}) => {
+    return (
+        <AccessibleButton
+            {...props}
+            role="menuitemcheckbox"
+            aria-checked={active}
+            aria-disabled={disabled}
+            disabled={disabled}
+            tabIndex={-1}
+            aria-label={label}
+        >
+            { children }
+        </AccessibleButton>
+    );
+};
--- a/src/accessibility/context_menu/MenuItemRadio.tsx
+++ b/src/accessibility/context_menu/MenuItemRadio.tsx
@ -0,0 +1,43 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import AccessibleButton from "../../components/views/elements/AccessibleButton";
+
+interface IProps extends React.ComponentProps<typeof AccessibleButton> {
+    label?: string;
+    active: boolean;
+}
+
+// Semantic component for representing a role=menuitemradio
+export const MenuItemRadio: React.FC<IProps> = ({children, label, active, disabled, ...props}) => {
+    return (
+        <AccessibleButton
+            {...props}
+            role="menuitemradio"
+            aria-checked={active}
+            aria-disabled={disabled}
+            disabled={disabled}
+            tabIndex={-1}
+            aria-label={label}
+        >
+            { children }
+        </AccessibleButton>
+    );
+};
--- a/src/accessibility/context_menu/StyledMenuItemCheckbox.tsx
+++ b/src/accessibility/context_menu/StyledMenuItemCheckbox.tsx
@ -0,0 +1,64 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import {Key} from "../../Keyboard";
+import StyledCheckbox from "../../components/views/elements/StyledCheckbox";
+
+interface IProps extends React.ComponentProps<typeof StyledCheckbox> {
+    label?: string;
+    onChange(); // we handle keyup/down ourselves so lose the ChangeEvent
+    onClose(): void; // gets called after onChange on Key.ENTER
+}
+
+// Semantic component for representing a styled role=menuitemcheckbox
+export const StyledMenuItemCheckbox: React.FC<IProps> = ({children, label, onChange, onClose, ...props}) => {
+    const onKeyDown = (e: React.KeyboardEvent) => {
+        if (e.key === Key.ENTER || e.key === Key.SPACE) {
+            e.stopPropagation();
+            e.preventDefault();
+            onChange();
+            // Implements https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-12
+            if (e.key === Key.ENTER) {
+                onClose();
+            }
+        }
+    };
+    const onKeyUp = (e: React.KeyboardEvent) => {
+        // prevent the input default handler as we handle it on keydown to match
+        // https://www.w3.org/TR/wai-aria-practices/examples/menubar/menubar-2/menubar-2.html
+        if (e.key === Key.SPACE || e.key === Key.ENTER) {
+            e.stopPropagation();
+            e.preventDefault();
+        }
+    };
+    return (
+        <StyledCheckbox
+            {...props}
+            role="menuitemcheckbox"
+            tabIndex={-1}
+            aria-label={label}
+            onChange={onChange}
+            onKeyDown={onKeyDown}
+            onKeyUp={onKeyUp}
+        >
+            { children }
+        </StyledCheckbox>
+    );
+};
--- a/src/accessibility/context_menu/StyledMenuItemRadio.tsx
+++ b/src/accessibility/context_menu/StyledMenuItemRadio.tsx
@ -0,0 +1,64 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import {Key} from "../../Keyboard";
+import StyledRadioButton from "../../components/views/elements/StyledRadioButton";
+
+interface IProps extends React.ComponentProps<typeof StyledRadioButton> {
+    label?: string;
+    onChange(); // we handle keyup/down ourselves so lose the ChangeEvent
+    onClose(): void; // gets called after onChange on Key.ENTER
+}
+
+// Semantic component for representing a styled role=menuitemradio
+export const StyledMenuItemRadio: React.FC<IProps> = ({children, label, onChange, onClose, ...props}) => {
+    const onKeyDown = (e: React.KeyboardEvent) => {
+        if (e.key === Key.ENTER || e.key === Key.SPACE) {
+            e.stopPropagation();
+            e.preventDefault();
+            onChange();
+            // Implements https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-12
+            if (e.key === Key.ENTER) {
+                onClose();
+            }
+        }
+    };
+    const onKeyUp = (e: React.KeyboardEvent) => {
+        // prevent the input default handler as we handle it on keydown to match
+        // https://www.w3.org/TR/wai-aria-practices/examples/menubar/menubar-2/menubar-2.html
+        if (e.key === Key.SPACE || e.key === Key.ENTER) {
+            e.stopPropagation();
+            e.preventDefault();
+        }
+    };
+    return (
+        <StyledRadioButton
+            {...props}
+            role="menuitemradio"
+            tabIndex={-1}
+            aria-label={label}
+            onChange={onChange}
+            onKeyDown={onKeyDown}
+            onKeyUp={onKeyUp}
+        >
+            { children }
+        </StyledRadioButton>
+    );
+};
--- a/src/components/structures/ContextMenu.tsx
+++ b/src/components/structures/ContextMenu.tsx
@ -16,15 +16,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import React, {useRef, useState} from 'react';
-import ReactDOM from 'react-dom';
-import PropTypes from 'prop-types';
-import classNames from 'classnames';
+import React, {CSSProperties, useRef, useState} from "react";
+import ReactDOM from "react-dom";
+import classNames from "classnames";
+
 import {Key} from "../../Keyboard";
-import * as sdk from "../../index";
-import AccessibleButton from "../views/elements/AccessibleButton";
-import StyledCheckbox from "../views/elements/StyledCheckbox";
-import StyledRadioButton from "../views/elements/StyledRadioButton";
+import {Writeable} from "../../@types/common";

 // Shamelessly ripped off Modal.js.  There's probably a better way
 // of doing reusable widgets like dialog boxes & menus where we go and
@ -32,8 +29,8 @@ import StyledRadioButton from "../views/elements/StyledRadioButton";

 const ContextualMenuContainerId = "mx_ContextualMenu_Container";

-function getOrCreateContainer() {
-    let container = document.getElementById(ContextualMenuContainerId);
+function getOrCreateContainer(): HTMLDivElement {
+    let container = document.getElementById(ContextualMenuContainerId) as HTMLDivElement;

    if (!container) {
        container = document.createElement("div");
@ -45,50 +42,70 @@ function getOrCreateContainer() {
 }

 const ARIA_MENU_ITEM_ROLES = new Set(["menuitem", "menuitemcheckbox", "menuitemradio"]);
+
+interface IPosition {
+    top?: number;
+    bottom?: number;
+    left?: number;
+    right?: number;
+}
+
+export enum ChevronFace {
+    Top = "top",
+    Bottom = "bottom",
+    Left = "left",
+    Right = "right",
+    None = "none",
+}
+
+interface IProps extends IPosition {
+    menuWidth?: number;
+    menuHeight?: number;
+
+    chevronOffset?: number;
+    chevronFace?: ChevronFace;
+
+    menuPaddingTop?: number;
+    menuPaddingBottom?: number;
+    menuPaddingLeft?: number;
+    menuPaddingRight?: number;
+
+    zIndex?: number;
+
+    // If true, insert an invisible screen-sized element behind the menu that when clicked will close it.
+    hasBackground?: boolean;
+    // whether this context menu should be focus managed. If false it must handle itself
+    managed?: boolean;
+
+    // Function to be called on menu close
+    onFinished();
+    // on resize callback
+    windowResize?();
+}
+
+interface IState {
+    contextMenuElem: HTMLDivElement;
+}
+
 // Generic ContextMenu Portal wrapper
 // all options inside the menu should be of role=menuitem/menuitemcheckbox/menuitemradiobutton and have tabIndex={-1}
 // this will allow the ContextMenu to manage its own focus using arrow keys as per the ARIA guidelines.
-export class ContextMenu extends React.Component {
-    static propTypes = {
-        top: PropTypes.number,
-        bottom: PropTypes.number,
-        left: PropTypes.number,
-        right: PropTypes.number,
-        menuWidth: PropTypes.number,
-        menuHeight: PropTypes.number,
-        chevronOffset: PropTypes.number,
-        chevronFace: PropTypes.string, // top, bottom, left, right or none
-        // Function to be called on menu close
-        onFinished: PropTypes.func.isRequired,
-        menuPaddingTop: PropTypes.number,
-        menuPaddingRight: PropTypes.number,
-        menuPaddingBottom: PropTypes.number,
-        menuPaddingLeft: PropTypes.number,
-        zIndex: PropTypes.number,
-
-        // If true, insert an invisible screen-sized element behind the
-        // menu that when clicked will close it.
-        hasBackground: PropTypes.bool,
-
-        // on resize callback
-        windowResize: PropTypes.func,
-
-        managed: PropTypes.bool, // whether this context menu should be focus managed. If false it must handle itself
-    };
+export class ContextMenu extends React.PureComponent<IProps, IState> {
+    private initialFocus: HTMLElement;

    static defaultProps = {
        hasBackground: true,
        managed: true,
    };

-    constructor() {
-        super();
+    constructor(props, context) {
+        super(props, context);
        this.state = {
            contextMenuElem: null,
        };

        // persist what had focus when we got initialized so we can return it after
-        this.initialFocus = document.activeElement;
+        this.initialFocus = document.activeElement as HTMLElement;
    }

    componentWillUnmount() {
@ -96,7 +113,7 @@ export class ContextMenu extends React.Component {
        this.initialFocus.focus();
    }

-    collectContextMenuRect = (element) => {
+    private collectContextMenuRect = (element) => {
        // We don't need to clean up when unmounting, so ignore
        if (!element) return;

@ -113,7 +130,7 @@ export class ContextMenu extends React.Component {
        });
    };

-    onContextMenu = (e) => {
+    private onContextMenu = (e) => {
        if (this.props.onFinished) {
            this.props.onFinished();

@ -136,20 +153,20 @@ export class ContextMenu extends React.Component {
        }
    };

-    onContextMenuPreventBubbling = (e) => {
+    private onContextMenuPreventBubbling = (e) => {
        // stop propagation so that any context menu handlers don't leak out of this context menu
        // but do not inhibit the default browser menu
        e.stopPropagation();
    };

    // Prevent clicks on the background from going through to the component which opened the menu.
-    _onFinished = (ev: InputEvent) => {
+    private onFinished = (ev: React.MouseEvent) => {
        ev.stopPropagation();
        ev.preventDefault();
        if (this.props.onFinished) this.props.onFinished();
    };

-    _onMoveFocus = (element, up) => {
+    private onMoveFocus = (element: Element, up: boolean) => {
        let descending = false; // are we currently descending or ascending through the DOM tree?

        do {
@ -183,25 +200,25 @@ export class ContextMenu extends React.Component {
        } while (element && !ARIA_MENU_ITEM_ROLES.has(element.getAttribute("role")));

        if (element) {
-            element.focus();
+            (element as HTMLElement).focus();
        }
    };

-    _onMoveFocusHomeEnd = (element, up) => {
+    private onMoveFocusHomeEnd = (element: Element, up: boolean) => {
        let results = element.querySelectorAll('[role^="menuitem"]');
        if (!results) {
            results = element.querySelectorAll('[tab-index]');
        }
        if (results && results.length) {
            if (up) {
-                results[0].focus();
+                (results[0] as HTMLElement).focus();
            } else {
-                results[results.length - 1].focus();
+                (results[results.length - 1] as HTMLElement).focus();
            }
        }
    };

-    _onKeyDown = (ev) => {
+    private onKeyDown = (ev: React.KeyboardEvent) => {
        if (!this.props.managed) {
            if (ev.key === Key.ESCAPE) {
                this.props.onFinished();
@ -219,16 +236,16 @@ export class ContextMenu extends React.Component {
                this.props.onFinished();
                break;
            case Key.ARROW_UP:
-                this._onMoveFocus(ev.target, true);
+                this.onMoveFocus(ev.target as Element, true);
                break;
            case Key.ARROW_DOWN:
-                this._onMoveFocus(ev.target, false);
+                this.onMoveFocus(ev.target as Element, false);
                break;
            case Key.HOME:
-                this._onMoveFocusHomeEnd(this.state.contextMenuElem, true);
+                this.onMoveFocusHomeEnd(this.state.contextMenuElem, true);
                break;
            case Key.END:
-                this._onMoveFocusHomeEnd(this.state.contextMenuElem, false);
+                this.onMoveFocusHomeEnd(this.state.contextMenuElem, false);
                break;
            default:
                handled = false;
@ -241,9 +258,8 @@ export class ContextMenu extends React.Component {
        }
    };

-    renderMenu(hasBackground=this.props.hasBackground) {
-        const position = {};
-        let chevronFace = null;
+    protected renderMenu(hasBackground = this.props.hasBackground) {
+        const position: Partial<Writeable<DOMRect>> = {};
        const props = this.props;

        if (props.top) {
@ -252,23 +268,24 @@ export class ContextMenu extends React.Component {
            position.bottom = props.bottom;
        }

+        let chevronFace: ChevronFace;
        if (props.left) {
            position.left = props.left;
-            chevronFace = 'left';
+            chevronFace = ChevronFace.Left;
        } else {
            position.right = props.right;
-            chevronFace = 'right';
+            chevronFace = ChevronFace.Right;
        }

        const contextMenuRect = this.state.contextMenuElem ? this.state.contextMenuElem.getBoundingClientRect() : null;

-        const chevronOffset = {};
+        const chevronOffset: CSSProperties = {};
        if (props.chevronFace) {
            chevronFace = props.chevronFace;
        }
-        const hasChevron = chevronFace && chevronFace !== "none";
+        const hasChevron = chevronFace && chevronFace !== ChevronFace.None;

-        if (chevronFace === 'top' || chevronFace === 'bottom') {
+        if (chevronFace === ChevronFace.Top || chevronFace === ChevronFace.Bottom) {
            chevronOffset.left = props.chevronOffset;
        } else if (position.top !== undefined) {
            const target = position.top;
@ -298,13 +315,13 @@ export class ContextMenu extends React.Component {
            'mx_ContextualMenu_right': !hasChevron && position.right,
            'mx_ContextualMenu_top': !hasChevron && position.top,
            'mx_ContextualMenu_bottom': !hasChevron && position.bottom,
-            'mx_ContextualMenu_withChevron_left': chevronFace === 'left',
-            'mx_ContextualMenu_withChevron_right': chevronFace === 'right',
-            'mx_ContextualMenu_withChevron_top': chevronFace === 'top',
-            'mx_ContextualMenu_withChevron_bottom': chevronFace === 'bottom',
+            'mx_ContextualMenu_withChevron_left': chevronFace === ChevronFace.Left,
+            'mx_ContextualMenu_withChevron_right': chevronFace === ChevronFace.Right,
+            'mx_ContextualMenu_withChevron_top': chevronFace === ChevronFace.Top,
+            'mx_ContextualMenu_withChevron_bottom': chevronFace === ChevronFace.Bottom,
        });

-        const menuStyle = {};
+        const menuStyle: CSSProperties = {};
        if (props.menuWidth) {
            menuStyle.width = props.menuWidth;
        }
@ -335,13 +352,28 @@ export class ContextMenu extends React.Component {
        let background;
        if (hasBackground) {
            background = (
-                <div className="mx_ContextualMenu_background" style={wrapperStyle} onClick={this._onFinished} onContextMenu={this.onContextMenu} />
+                <div
+                    className="mx_ContextualMenu_background"
+                    style={wrapperStyle}
+                    onClick={this.onFinished}
+                    onContextMenu={this.onContextMenu}
+                />
            );
        }

        return (
-            <div className="mx_ContextualMenu_wrapper" style={{...position, ...wrapperStyle}} onKeyDown={this._onKeyDown} onContextMenu={this.onContextMenuPreventBubbling}>
-                <div className={menuClasses} style={menuStyle} ref={this.collectContextMenuRect} role={this.props.managed ? "menu" : undefined}>
+            <div
+                className="mx_ContextualMenu_wrapper"
+                style={{...position, ...wrapperStyle}}
+                onKeyDown={this.onKeyDown}
+                onContextMenu={this.onContextMenuPreventBubbling}
+            >
+                <div
+                    className={menuClasses}
+                    style={menuStyle}
+                    ref={this.collectContextMenuRect}
+                    role={this.props.managed ? "menu" : undefined}
+                >
                    { chevron }
                    { props.children }
                </div>
@ -350,195 +382,13 @@ export class ContextMenu extends React.Component {
        );
    }

-    render() {
+    render(): React.ReactChild {
        return ReactDOM.createPortal(this.renderMenu(), getOrCreateContainer());
    }
 }

-// Semantic component for representing the AccessibleButton which launches a <ContextMenu />
-export const ContextMenuButton = ({ label, isExpanded, children, onClick, onContextMenu, ...props }) => {
-    const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
-    return (
-        <AccessibleButton
-            {...props}
-            onClick={onClick}
-            onContextMenu={onContextMenu || onClick}
-            title={label}
-            aria-label={label}
-            aria-haspopup={true}
-            aria-expanded={isExpanded}
-        >
-            { children }
-        </AccessibleButton>
-    );
-};
-ContextMenuButton.propTypes = {
-    ...AccessibleButton.propTypes,
-    label: PropTypes.string,
-    isExpanded: PropTypes.bool.isRequired, // whether or not the context menu is currently open
-};
-
-// Semantic component for representing a role=menuitem
-export const MenuItem = ({children, label, ...props}) => {
-    const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
-    return (
-        <AccessibleButton {...props} role="menuitem" tabIndex={-1} aria-label={label}>
-            { children }
-        </AccessibleButton>
-    );
-};
-MenuItem.propTypes = {
-    ...AccessibleButton.propTypes,
-    label: PropTypes.string, // optional
-    className: PropTypes.string, // optional
-    onClick: PropTypes.func.isRequired,
-};
-
-// Semantic component for representing a role=group for grouping menu radios/checkboxes
-export const MenuGroup = ({children, label, ...props}) => {
-    return <div {...props} role="group" aria-label={label}>
-        { children }
-    </div>;
-};
-MenuGroup.propTypes = {
-    label: PropTypes.string.isRequired,
-    className: PropTypes.string, // optional
-};
-
-// Semantic component for representing a role=menuitemcheckbox
-export const MenuItemCheckbox = ({children, label, active=false, disabled=false, ...props}) => {
-    const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
-    return (
-        <AccessibleButton {...props} role="menuitemcheckbox" aria-checked={active} aria-disabled={disabled} tabIndex={-1} aria-label={label}>
-            { children }
-        </AccessibleButton>
-    );
-};
-MenuItemCheckbox.propTypes = {
-    ...AccessibleButton.propTypes,
-    label: PropTypes.string, // optional
-    active: PropTypes.bool.isRequired,
-    disabled: PropTypes.bool, // optional
-    className: PropTypes.string, // optional
-    onClick: PropTypes.func.isRequired,
-};
-
-// Semantic component for representing a styled role=menuitemcheckbox
-export const StyledMenuItemCheckbox = ({children, label, onChange, onClose, checked, disabled=false, ...props}) => {
-    const onKeyDown = (e) => {
-        if (e.key === Key.ENTER || e.key === Key.SPACE) {
-            e.stopPropagation();
-            e.preventDefault();
-            onChange();
-            // Implements https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-12
-            if (e.key === Key.ENTER) {
-                onClose();
-            }
-        }
-    };
-    const onKeyUp = (e) => {
-        // prevent the input default handler as we handle it on keydown to match
-        // https://www.w3.org/TR/wai-aria-practices/examples/menubar/menubar-2/menubar-2.html
-        if (e.key === Key.SPACE || e.key === Key.ENTER) {
-            e.stopPropagation();
-            e.preventDefault();
-        }
-    };
-    return (
-        <StyledCheckbox
-            {...props}
-            role="menuitemcheckbox"
-            aria-checked={checked}
-            checked={checked}
-            aria-disabled={disabled}
-            tabIndex={-1}
-            aria-label={label}
-            onChange={onChange}
-            onKeyDown={onKeyDown}
-            onKeyUp={onKeyUp}
-        >
-            { children }
-        </StyledCheckbox>
-    );
-};
-StyledMenuItemCheckbox.propTypes = {
-    ...StyledCheckbox.propTypes,
-    label: PropTypes.string, // optional
-    checked: PropTypes.bool.isRequired,
-    disabled: PropTypes.bool, // optional
-    className: PropTypes.string, // optional
-    onChange: PropTypes.func.isRequired,
-    onClose: PropTypes.func.isRequired, // gets called after onChange on Key.ENTER
-};
-
-// Semantic component for representing a role=menuitemradio
-export const MenuItemRadio = ({children, label, active=false, disabled=false, ...props}) => {
-    const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
-    return (
-        <AccessibleButton {...props} role="menuitemradio" aria-checked={active} aria-disabled={disabled} tabIndex={-1} aria-label={label}>
-            { children }
-        </AccessibleButton>
-    );
-};
-MenuItemRadio.propTypes = {
-    ...AccessibleButton.propTypes,
-    label: PropTypes.string, // optional
-    active: PropTypes.bool.isRequired,
-    disabled: PropTypes.bool, // optional
-    className: PropTypes.string, // optional
-    onClick: PropTypes.func.isRequired,
-};
-
-// Semantic component for representing a styled role=menuitemradio
-export const StyledMenuItemRadio = ({children, label, onChange, onClose, checked=false, disabled=false, ...props}) => {
-    const onKeyDown = (e) => {
-        if (e.key === Key.ENTER || e.key === Key.SPACE) {
-            e.stopPropagation();
-            e.preventDefault();
-            onChange();
-            // Implements https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-12
-            if (e.key === Key.ENTER) {
-                onClose();
-            }
-        }
-    };
-    const onKeyUp = (e) => {
-        // prevent the input default handler as we handle it on keydown to match
-        // https://www.w3.org/TR/wai-aria-practices/examples/menubar/menubar-2/menubar-2.html
-        if (e.key === Key.SPACE || e.key === Key.ENTER) {
-            e.stopPropagation();
-            e.preventDefault();
-        }
-    };
-    return (
-        <StyledRadioButton
-            {...props}
-            role="menuitemradio"
-            aria-checked={checked}
-            checked={checked}
-            aria-disabled={disabled}
-            tabIndex={-1}
-            aria-label={label}
-            onChange={onChange}
-            onKeyDown={onKeyDown}
-            onKeyUp={onKeyUp}
-        >
-            { children }
-        </StyledRadioButton>
-    );
-};
-StyledMenuItemRadio.propTypes = {
-    ...StyledMenuItemRadio.propTypes,
-    label: PropTypes.string, // optional
-    checked: PropTypes.bool.isRequired,
-    disabled: PropTypes.bool, // optional
-    className: PropTypes.string, // optional
-    onChange: PropTypes.func.isRequired,
-    onClose: PropTypes.func.isRequired, // gets called after onChange on Key.ENTER
-};
-
 // Placement method for <ContextMenu /> to position context menu to right of elementRect with chevronOffset
-export const toRightOf = (elementRect, chevronOffset=12) => {
+export const toRightOf = (elementRect: DOMRect, chevronOffset = 12) => {
    const left = elementRect.right + window.pageXOffset + 3;
    let top = elementRect.top + (elementRect.height / 2) + window.pageYOffset;
    top -= chevronOffset + 8; // where 8 is half the height of the chevron
@ -546,8 +396,8 @@ export const toRightOf = (elementRect, chevronOffset=12) => {
 };

 // Placement method for <ContextMenu /> to position context menu right-aligned and flowing to the left of elementRect
-export const aboveLeftOf = (elementRect, chevronFace="none") => {
-    const menuOptions = { chevronFace };
+export const aboveLeftOf = (elementRect: DOMRect, chevronFace = ChevronFace.None) => {
+    const menuOptions: IPosition & { chevronFace: ChevronFace } = { chevronFace };

    const buttonRight = elementRect.right + window.pageXOffset;
    const buttonBottom = elementRect.bottom + window.pageYOffset;
@ -605,3 +455,12 @@ export function createMenu(ElementClass, props) {

    return {close: onFinished};
 }
+
+// re-export the semantic helper components for simplicity
+export {ContextMenuButton} from "../../accessibility/context_menu/ContextMenuButton";
+export {MenuGroup} from "../../accessibility/context_menu/MenuGroup";
+export {MenuItem} from "../../accessibility/context_menu/MenuItem";
+export {MenuItemCheckbox} from "../../accessibility/context_menu/MenuItemCheckbox";
+export {MenuItemRadio} from "../../accessibility/context_menu/MenuItemRadio";
+export {StyledMenuItemCheckbox} from "../../accessibility/context_menu/StyledMenuItemCheckbox";
+export {StyledMenuItemRadio} from "../../accessibility/context_menu/StyledMenuItemRadio";
--- a/src/components/structures/LeftPanel2.tsx
+++ b/src/components/structures/LeftPanel2.tsx
@ -21,6 +21,7 @@ import classNames from "classnames";
 import dis from "../../dispatcher/dispatcher";
 import { _t } from "../../languageHandler";
 import RoomList2 from "../views/rooms/RoomList2";
+import { HEADER_HEIGHT } from "../views/rooms/RoomSublist2";
 import { Action } from "../../dispatcher/actions";
 import UserMenu from "./UserMenu";
 import RoomSearch from "./RoomSearch";
@ -114,64 +115,131 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
    };

    private handleStickyHeaders(list: HTMLDivElement) {
-        // TODO: Evaluate if this has any performance benefit or detriment.
-        // See https://github.com/vector-im/riot-web/issues/14035
-
        if (this.isDoingStickyHeaders) return;
        this.isDoingStickyHeaders = true;
-        if (window.requestAnimationFrame) {
        window.requestAnimationFrame(() => {
            this.doStickyHeaders(list);
            this.isDoingStickyHeaders = false;
        });
-        } else {
-            this.doStickyHeaders(list);
-            this.isDoingStickyHeaders = false;
-        }
    }

    private doStickyHeaders(list: HTMLDivElement) {
-        const rlRect = list.getBoundingClientRect();
-        const bottom = rlRect.bottom;
-        const top = rlRect.top;
+        const topEdge = list.scrollTop;
+        const bottomEdge = list.offsetHeight + list.scrollTop;
        const sublists = list.querySelectorAll<HTMLDivElement>(".mx_RoomSublist2");
-        const headerHeight = 32; // Note: must match the CSS!
-        const headerRightMargin = 24; // calculated from margins and widths to align with non-sticky tiles

-        const headerStickyWidth = rlRect.width - headerRightMargin;
+        const headerRightMargin = 16; // calculated from margins and widths to align with non-sticky tiles
+        const headerStickyWidth = list.clientWidth - headerRightMargin;
+
+        // We track which styles we want on a target before making the changes to avoid
+        // excessive layout updates.
+        const targetStyles = new Map<HTMLDivElement, {
+            stickyTop?: boolean;
+            stickyBottom?: boolean;
+            makeInvisible?: boolean;
+        }>();

-        let gotBottom = false;
        let lastTopHeader;
+        let firstBottomHeader;
        for (const sublist of sublists) {
-            const slRect = sublist.getBoundingClientRect();
-
            const header = sublist.querySelector<HTMLDivElement>(".mx_RoomSublist2_stickable");
+            header.style.removeProperty("display"); // always clear display:none first

-            if (slRect.top + headerHeight > bottom && !gotBottom) {
-                header.classList.add("mx_RoomSublist2_headerContainer_sticky");
-                header.classList.add("mx_RoomSublist2_headerContainer_stickyBottom");
-                header.style.width = `${headerStickyWidth}px`;
-                header.style.removeProperty("top");
-                gotBottom = true;
-            } else if ((slRect.top - (headerHeight / 3)) < top) {
-                header.classList.add("mx_RoomSublist2_headerContainer_sticky");
-                header.classList.add("mx_RoomSublist2_headerContainer_stickyTop");
-                header.style.width = `${headerStickyWidth}px`;
-                header.style.top = `${rlRect.top}px`;
+            // When an element is <=40% off screen, make it take over
+            const offScreenFactor = 0.4;
+            const isOffTop = (sublist.offsetTop + (offScreenFactor * HEADER_HEIGHT)) <= topEdge;
+            const isOffBottom = (sublist.offsetTop + (offScreenFactor * HEADER_HEIGHT)) >= bottomEdge;
+
+            if (isOffTop || sublist === sublists[0]) {
+                targetStyles.set(header, { stickyTop: true });
                if (lastTopHeader) {
                    lastTopHeader.style.display = "none";
+                    targetStyles.set(lastTopHeader, { makeInvisible: true });
                }
-                // first unset it, if set in last iteration
-                header.style.removeProperty("display");
                lastTopHeader = header;
+            } else if (isOffBottom && !firstBottomHeader) {
+                targetStyles.set(header, { stickyBottom: true });
+                firstBottomHeader = header;
            } else {
-                header.classList.remove("mx_RoomSublist2_headerContainer_sticky");
-                header.classList.remove("mx_RoomSublist2_headerContainer_stickyTop");
-                header.classList.remove("mx_RoomSublist2_headerContainer_stickyBottom");
-                header.style.removeProperty("width");
-                header.style.removeProperty("top");
+                targetStyles.set(header, {}); // nothing == clear
            }
        }
+
+        // Run over the style changes and make them reality. We check to see if we're about to
+        // cause a no-op update, as adding/removing properties that are/aren't there cause
+        // layout updates.
+        for (const header of targetStyles.keys()) {
+            const style = targetStyles.get(header);
+            const headerContainer = header.parentElement; // .mx_RoomSublist2_headerContainer
+
+            if (style.makeInvisible) {
+                // we will have already removed the 'display: none', so add it back.
+                header.style.display = "none";
+                continue; // nothing else to do, even if sticky somehow
+            }
+
+            if (style.stickyTop) {
+                if (!header.classList.contains("mx_RoomSublist2_headerContainer_stickyTop")) {
+                    header.classList.add("mx_RoomSublist2_headerContainer_stickyTop");
+                }
+
+                const newTop = `${list.parentElement.offsetTop}px`;
+                if (header.style.top !== newTop) {
+                    header.style.top = newTop;
+                }
+            } else if (style.stickyBottom) {
+                if (!header.classList.contains("mx_RoomSublist2_headerContainer_stickyBottom")) {
+                    header.classList.add("mx_RoomSublist2_headerContainer_stickyBottom");
+                }
+            }
+
+            if (style.stickyTop || style.stickyBottom) {
+                if (!header.classList.contains("mx_RoomSublist2_headerContainer_sticky")) {
+                    header.classList.add("mx_RoomSublist2_headerContainer_sticky");
+                }
+                if (!headerContainer.classList.contains("mx_RoomSublist2_headerContainer_hasSticky")) {
+                    headerContainer.classList.add("mx_RoomSublist2_headerContainer_hasSticky");
+                }
+
+                const newWidth = `${headerStickyWidth}px`;
+                if (header.style.width !== newWidth) {
+                    header.style.width = newWidth;
+                }
+            } else if (!style.stickyTop && !style.stickyBottom) {
+                if (header.classList.contains("mx_RoomSublist2_headerContainer_sticky")) {
+                    header.classList.remove("mx_RoomSublist2_headerContainer_sticky");
+                }
+                if (header.classList.contains("mx_RoomSublist2_headerContainer_stickyTop")) {
+                    header.classList.remove("mx_RoomSublist2_headerContainer_stickyTop");
+                }
+                if (header.classList.contains("mx_RoomSublist2_headerContainer_stickyBottom")) {
+                    header.classList.remove("mx_RoomSublist2_headerContainer_stickyBottom");
+                }
+                if (headerContainer.classList.contains("mx_RoomSublist2_headerContainer_hasSticky")) {
+                    headerContainer.classList.remove("mx_RoomSublist2_headerContainer_hasSticky");
+                }
+                if (header.style.width) {
+                    header.style.removeProperty('width');
+                }
+                if (header.style.top) {
+                    header.style.removeProperty('top');
+                }
+            }
+        }
+
+        // add appropriate sticky classes to wrapper so it has
+        // the necessary top/bottom padding to put the sticky header in
+        const listWrapper = list.parentElement; // .mx_LeftPanel2_roomListWrapper
+        if (lastTopHeader) {
+            listWrapper.classList.add("mx_LeftPanel2_roomListWrapper_stickyTop");
+        } else {
+            listWrapper.classList.remove("mx_LeftPanel2_roomListWrapper_stickyTop");
+        }
+        if (firstBottomHeader) {
+            listWrapper.classList.add("mx_LeftPanel2_roomListWrapper_stickyBottom");
+        } else {
+            listWrapper.classList.remove("mx_LeftPanel2_roomListWrapper_stickyBottom");
+        }
    }

    // TODO: Improve header reliability: https://github.com/vector-im/riot-web/issues/14232
@ -325,6 +393,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
                <aside className="mx_LeftPanel2_roomListContainer">
                    {this.renderHeader()}
                    {this.renderSearchExplore()}
+                    <div className="mx_LeftPanel2_roomListWrapper">
                        <div
                            className={roomListClasses}
                            onScroll={this.onScroll}
@ -335,6 +404,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
                        >
                            {roomList}
                        </div>
+                    </div>
                </aside>
            </div>
        );
--- a/src/components/structures/LoggedInView.tsx
+++ b/src/components/structures/LoggedInView.tsx
@ -52,6 +52,7 @@ import {
 } from "../../toasts/ServerLimitToast";
 import { Action } from "../../dispatcher/actions";
 import LeftPanel2 from "./LeftPanel2";
+import CallContainer from '../views/voip/CallContainer';
 import { ViewRoomDeltaPayload } from "../../dispatcher/payloads/ViewRoomDeltaPayload";

 // We need to fetch each pinned message individually (if we don't already have it)
@ -696,6 +697,7 @@ class LoggedInView extends React.Component<IProps, IState> {
                        </div>
                    </DragDropContext>
                </div>
+                <CallContainer />
            </MatrixClientContext.Provider>
        );
    }
--- a/src/components/structures/RoomSearch.tsx
+++ b/src/components/structures/RoomSearch.tsx
@ -82,6 +82,7 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {

    private openSearch = () => {
        defaultDispatcher.dispatch({action: "show_left_panel"});
+        defaultDispatcher.dispatch({action: "focus_room_filter"});
    };

    private onChange = () => {
--- a/src/components/structures/RoomView.js
+++ b/src/components/structures/RoomView.js
@ -2044,6 +2044,7 @@ export default createReactClass({
        if (!this.state.atEndOfLiveTimeline && !this.state.searchResults) {
            const JumpToBottomButton = sdk.getComponent('rooms.JumpToBottomButton');
            jumpToBottom = (<JumpToBottomButton
+                highlight={this.state.room.getUnreadNotificationCount('highlight') > 0}
                numUnreadMessages={this.state.numUnreadMessages}
                onScrollToBottomClick={this.jumpToLiveTimeline}
            />);
--- a/src/components/structures/UserMenu.tsx
+++ b/src/components/structures/UserMenu.tsx
@ -14,14 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import * as React from "react";
+import React, { createRef } from "react";
 import { MatrixClientPeg } from "../../MatrixClientPeg";
 import defaultDispatcher from "../../dispatcher/dispatcher";
 import { ActionPayload } from "../../dispatcher/payloads";
 import { Action } from "../../dispatcher/actions";
-import { createRef } from "react";
 import { _t } from "../../languageHandler";
-import {ContextMenu, ContextMenuButton, MenuItem} from "./ContextMenu";
+import { ChevronFace, ContextMenu, ContextMenuButton, MenuItem } from "./ContextMenu";
 import {USER_NOTIFICATIONS_TAB, USER_SECURITY_TAB} from "../views/dialogs/UserSettingsDialog";
 import { OpenToTabPayload } from "../../dispatcher/payloads/OpenToTabPayload";
 import RedesignFeedbackDialog from "../views/dialogs/RedesignFeedbackDialog";
@ -122,7 +121,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
        }
    };

-    private onOpenMenuClick = (ev: InputEvent) => {
+    private onOpenMenuClick = (ev: React.MouseEvent) => {
        ev.preventDefault();
        ev.stopPropagation();
        const target = ev.target as HTMLButtonElement;
@ -235,7 +234,7 @@ export default class UserMenu extends React.Component<IProps, IState> {

        return (
            <ContextMenu
-                chevronFace="none"
+                chevronFace={ChevronFace.None}
                // -20 to overlap the context menu by just over the width of the `...` icon and make it look connected
                left={this.state.contextMenuPosition.width + this.state.contextMenuPosition.left - 20}
                top={this.state.contextMenuPosition.top + this.state.contextMenuPosition.height}
@ -281,11 +280,11 @@ export default class UserMenu extends React.Component<IProps, IState> {
                            label={_t("All settings")}
                            onClick={(e) => this.onSettingsOpen(e, null)}
                        />
-                        <MenuButton
+                        {/* <MenuButton
                            iconClassName="mx_UserMenu_iconArchive"
                            label={_t("Archived rooms")}
                            onClick={this.onShowArchived}
-                        />
+                        /> */}
                        <MenuButton
                            iconClassName="mx_UserMenu_iconMessage"
                            label={_t("Feedback")}
@ -348,8 +347,8 @@ export default class UserMenu extends React.Component<IProps, IState> {
                        {name}
                        {buttons}
                    </div>
-                    {this.renderContextMenu()}
                </ContextMenuButton>
+                {this.renderContextMenu()}
            </React.Fragment>
        );
    }
--- a/src/components/views/avatars/BaseAvatar.tsx
+++ b/src/components/views/avatars/BaseAvatar.tsx
@ -18,7 +18,7 @@ limitations under the License.
 */

 import React, {useCallback, useContext, useEffect, useMemo, useState} from 'react';
-import PropTypes from 'prop-types';
+import classNames from 'classnames';
 import * as AvatarLogic from '../../../Avatar';
 import SettingsStore from "../../../settings/SettingsStore";
 import AccessibleButton from '../elements/AccessibleButton';
@ -26,9 +26,25 @@ import MatrixClientContext from "../../../contexts/MatrixClientContext";
 import {useEventEmitter} from "../../../hooks/useEventEmitter";
 import {toPx} from "../../../utils/units";

-const useImageUrl = ({url, urls}) => {
-    const [imageUrls, setUrls] = useState([]);
-    const [urlsIndex, setIndex] = useState();
+interface IProps {
+    name: string; // The name (first initial used as default)
+    idName?: string; // ID for generating hash colours
+    title?: string; // onHover title text
+    url?: string; // highest priority of them all, shortcut to set in urls[0]
+    urls?: string[]; // [highest_priority, ... , lowest_priority]
+    width?: number;
+    height?: number;
+    // XXX: resizeMethod not actually used.
+    resizeMethod?: string;
+    defaultToInitialLetter?: boolean; // true to add default url
+    onClick?: React.MouseEventHandler;
+    inputRef?: React.RefObject<HTMLImageElement & HTMLSpanElement>;
+    className?: string;
+}
+
+const useImageUrl = ({url, urls}): [string, () => void] => {
+    const [imageUrls, setUrls] = useState<string[]>([]);
+    const [urlsIndex, setIndex] = useState<number>();

    const onError = useCallback(() => {
        setIndex(i => i + 1); // try the next one
@ -70,17 +86,17 @@ const useImageUrl = ({url, urls}) => {
    return [imageUrl, onError];
 };

-const BaseAvatar = (props) => {
+const BaseAvatar = (props: IProps) => {
    const {
        name,
        idName,
        title,
        url,
        urls,
-        width=40,
-        height=40,
-        resizeMethod="crop", // eslint-disable-line no-unused-vars
-        defaultToInitialLetter=true,
+        width = 40,
+        height = 40,
+        resizeMethod = "crop", // eslint-disable-line no-unused-vars
+        defaultToInitialLetter = true,
        onClick,
        inputRef,
        ...otherProps
@ -117,7 +133,7 @@ const BaseAvatar = (props) => {
                aria-hidden="true" />
        );

-        if (onClick != null) {
+        if (onClick !== null) {
            return (
                <AccessibleButton
                    {...otherProps}
@ -132,7 +148,12 @@ const BaseAvatar = (props) => {
            );
        } else {
            return (
-                <span className="mx_BaseAvatar" ref={inputRef} {...otherProps} role="presentation">
+                <span
+                    className="mx_BaseAvatar"
+                    ref={inputRef}
+                    {...otherProps}
+                    role="presentation"
+                >
                    { textNode }
                    { imgNode }
                </span>
@ -140,7 +161,7 @@ const BaseAvatar = (props) => {
        }
    }

-    if (onClick != null) {
+    if (onClick !== null) {
        return (
            <AccessibleButton
                className="mx_BaseAvatar mx_BaseAvatar_image"
@ -173,26 +194,5 @@ const BaseAvatar = (props) => {
    }
 };

-BaseAvatar.displayName = "BaseAvatar";
-
-BaseAvatar.propTypes = {
-    name: PropTypes.string.isRequired, // The name (first initial used as default)
-    idName: PropTypes.string, // ID for generating hash colours
-    title: PropTypes.string, // onHover title text
-    url: PropTypes.string, // highest priority of them all, shortcut to set in urls[0]
-    urls: PropTypes.array, // [highest_priority, ... , lowest_priority]
-    width: PropTypes.number,
-    height: PropTypes.number,
-    // XXX resizeMethod not actually used.
-    resizeMethod: PropTypes.string,
-    defaultToInitialLetter: PropTypes.bool, // true to add default url
-    onClick: PropTypes.func,
-    inputRef: PropTypes.oneOfType([
-        // Either a function
-        PropTypes.func,
-        // Or the instance of a DOM native element
-        PropTypes.shape({ current: PropTypes.instanceOf(Element) }),
-    ]),
-};
-
 export default BaseAvatar;
+export type BaseAvatarType = React.FC<IProps>;
--- a/src/components/views/avatars/DecoratedRoomAvatar.tsx
+++ b/src/components/views/avatars/DecoratedRoomAvatar.tsx
@ -21,8 +21,8 @@ import { TagID } from '../../../stores/room-list/models';
 import RoomAvatar from "./RoomAvatar";
 import RoomTileIcon from "../rooms/RoomTileIcon";
 import NotificationBadge from '../rooms/NotificationBadge';
-import { INotificationState } from "../../../stores/notifications/INotificationState";
-import { TagSpecificNotificationState } from "../../../stores/notifications/TagSpecificNotificationState";
+import { RoomNotificationStateStore } from "../../../stores/notifications/RoomNotificationStateStore";
+import { NotificationState } from "../../../stores/notifications/NotificationState";

 interface IProps {
    room: Room;
@ -33,7 +33,7 @@ interface IProps {
 }

 interface IState {
-    notificationState?: INotificationState;
+    notificationState?: NotificationState;
 }

 export default class DecoratedRoomAvatar extends React.PureComponent<IProps, IState> {
@ -42,7 +42,7 @@ export default class DecoratedRoomAvatar extends React.PureComponent<IProps, ISt
        super(props);

        this.state = {
-            notificationState: new TagSpecificNotificationState(this.props.room, this.props.tag),
+            notificationState: RoomNotificationStateStore.instance.getRoomState(this.props.room, this.props.tag),
        };
    }

--- a/src/components/views/avatars/GroupAvatar.tsx
+++ b/src/components/views/avatars/GroupAvatar.tsx
@ -15,43 +15,36 @@ limitations under the License.
 */

 import React from 'react';
-import PropTypes from 'prop-types';
-import createReactClass from 'create-react-class';
-import * as sdk from '../../../index';
 import {MatrixClientPeg} from '../../../MatrixClientPeg';
+import BaseAvatar from './BaseAvatar';

-export default createReactClass({
-    displayName: 'GroupAvatar',
+export interface IProps {
+        groupId?: string;
+        groupName?: string;
+        groupAvatarUrl?: string;
+        width?: number;
+        height?: number;
+        resizeMethod?: string;
+        onClick?: React.MouseEventHandler;
+}

-    propTypes: {
-        groupId: PropTypes.string,
-        groupName: PropTypes.string,
-        groupAvatarUrl: PropTypes.string,
-        width: PropTypes.number,
-        height: PropTypes.number,
-        resizeMethod: PropTypes.string,
-        onClick: PropTypes.func,
-    },
-
-    getDefaultProps: function() {
-        return {
+export default class GroupAvatar extends React.Component<IProps> {
+    public static defaultProps = {
        width: 36,
        height: 36,
        resizeMethod: 'crop',
    };
-    },

-    getGroupAvatarUrl: function() {
+    getGroupAvatarUrl() {
        return MatrixClientPeg.get().mxcUrlToHttp(
            this.props.groupAvatarUrl,
            this.props.width,
            this.props.height,
            this.props.resizeMethod,
        );
-    },
+    }

-    render: function() {
-        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
+    render() {
        // extract the props we use from props so we can pass any others through
        // should consider adding this as a global rule in js-sdk?
        /*eslint no-unused-vars: ["error", { "ignoreRestSiblings": true }]*/
@ -65,5 +58,5 @@ export default createReactClass({
                {...otherProps}
            />
        );
-    },
-});
+    }
+}
--- a/src/components/views/avatars/MemberAvatar.tsx
+++ b/src/components/views/avatars/MemberAvatar.tsx
@ -16,48 +16,50 @@ limitations under the License.
 */

 import React from 'react';
-import PropTypes from 'prop-types';
-import createReactClass from 'create-react-class';
-import * as sdk from "../../../index";
 import dis from "../../../dispatcher/dispatcher";
 import {Action} from "../../../dispatcher/actions";
 import {MatrixClientPeg} from "../../../MatrixClientPeg";
+import BaseAvatar from "./BaseAvatar";

-export default createReactClass({
-    displayName: 'MemberAvatar',
-
-    propTypes: {
-        member: PropTypes.object,
-        fallbackUserId: PropTypes.string,
-        width: PropTypes.number,
-        height: PropTypes.number,
-        resizeMethod: PropTypes.string,
+interface IProps {
+    // TODO: replace with correct type
+    member: any;
+    fallbackUserId: string;
+    width: number;
+    height: number;
+    resizeMethod: string;
    // The onClick to give the avatar
-        onClick: PropTypes.func,
+    onClick: React.MouseEventHandler;
    // Whether the onClick of the avatar should be overriden to dispatch `Action.ViewUser`
-        viewUserOnClick: PropTypes.bool,
-        title: PropTypes.string,
-    },
+    viewUserOnClick: boolean;
+    title: string;
+}

-    getDefaultProps: function() {
-        return {
+interface IState {
+    name: string;
+    title: string;
+    imageUrl?: string;
+}
+
+export default class MemberAvatar extends React.Component<IProps, IState> {
+    public static defaultProps = {
        width: 40,
        height: 40,
        resizeMethod: 'crop',
        viewUserOnClick: false,
    };
-    },

-    getInitialState: function() {
-        return this._getState(this.props);
-    },
+    constructor(props: IProps) {
+        super(props);

-    // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    UNSAFE_componentWillReceiveProps: function(nextProps) {
-        this.setState(this._getState(nextProps));
-    },
+        this.state = MemberAvatar.getState(props);
+    }

-    _getState: function(props) {
+    public static getDerivedStateFromProps(nextProps: IProps): IState {
+        return MemberAvatar.getState(nextProps);
+    }
+
+    private static getState(props: IProps): IState {
        if (props.member && props.member.name) {
            return {
                name: props.member.name,
@ -79,11 +81,9 @@ export default createReactClass({
        } else {
            console.error("MemberAvatar called somehow with null member or fallbackUserId");
        }
-    },
-
-    render: function() {
-        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
+    }

+    render() {
        let {member, fallbackUserId, onClick, viewUserOnClick, ...otherProps} = this.props;
        const userId = member ? member.userId : fallbackUserId;

@ -100,5 +100,5 @@ export default createReactClass({
            <BaseAvatar {...otherProps} name={this.state.name} title={this.state.title}
                idName={userId} url={this.state.imageUrl} onClick={onClick} />
        );
-    },
-});
+    }
+}
--- a/src/stores/notifications/INotificationState.ts
+++ b/src/stores/notifications/INotificationState.ts
@ -14,13 +14,15 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import { EventEmitter } from "events";
-import { NotificationColor } from "./NotificationColor";
+import React from 'react';

-export const NOTIFICATION_STATE_UPDATE = "update";
-
-export interface INotificationState extends EventEmitter {
-    symbol?: string;
-    count: number;
-    color: NotificationColor;
+interface IProps {
 }
+
+const PulsedAvatar: React.FC<IProps> = (props) => {
+    return <div className="mx_PulsedAvatar">
+        {props.children}
+    </div>;
+};
+
+export default PulsedAvatar;
--- a/src/components/views/avatars/RoomAvatar.tsx
+++ b/src/components/views/avatars/RoomAvatar.tsx
@ -13,90 +13,96 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-import React from "react";
-import PropTypes from 'prop-types';
-import createReactClass from 'create-react-class';
-import {MatrixClientPeg} from "../../../MatrixClientPeg";
+import React from 'react';
+import Room from 'matrix-js-sdk/src/models/room';
+import {getHttpUriForMxc} from 'matrix-js-sdk/src/content-repo';
+
+import BaseAvatar from './BaseAvatar';
+import ImageView from '../elements/ImageView';
+import {MatrixClientPeg} from '../../../MatrixClientPeg';
 import Modal from '../../../Modal';
-import * as sdk from "../../../index";
 import * as Avatar from '../../../Avatar';
-import {getHttpUriForMxc} from "matrix-js-sdk/src/content-repo";
-
-export default createReactClass({
-    displayName: 'RoomAvatar',

+interface IProps {
    // Room may be left unset here, but if it is,
    // oobData.avatarUrl should be set (else there
    // would be nowhere to get the avatar from)
-    propTypes: {
-        room: PropTypes.object,
-        oobData: PropTypes.object,
-        width: PropTypes.number,
-        height: PropTypes.number,
-        resizeMethod: PropTypes.string,
-        viewAvatarOnClick: PropTypes.bool,
-    },
+    room?: Room;
+    // TODO: type when js-sdk has types
+    oobData?: any;
+    width?: number;
+    height?: number;
+    resizeMethod?: string;
+    viewAvatarOnClick?: boolean;
+}

-    getDefaultProps: function() {
-        return {
+interface IState {
+    urls: string[];
+}
+
+export default class RoomAvatar extends React.Component<IProps, IState> {
+    public static defaultProps = {
        width: 36,
        height: 36,
        resizeMethod: 'crop',
        oobData: {},
    };
-    },

-    getInitialState: function() {
-        return {
-            urls: this.getImageUrls(this.props),
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {
+            urls: RoomAvatar.getImageUrls(this.props),
        };
-    },
+    }

-    componentDidMount: function() {
+    public componentDidMount() {
        MatrixClientPeg.get().on("RoomState.events", this.onRoomStateEvents);
-    },
+    }

-    componentWillUnmount: function() {
+    public componentWillUnmount() {
        const cli = MatrixClientPeg.get();
        if (cli) {
            cli.removeListener("RoomState.events", this.onRoomStateEvents);
        }
-    },
+    }

-    // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    UNSAFE_componentWillReceiveProps: function(newProps) {
-        this.setState({
-            urls: this.getImageUrls(newProps),
-        });
-    },
+    public static getDerivedStateFromProps(nextProps: IProps): IState {
+        return {
+            urls: RoomAvatar.getImageUrls(nextProps),
+        };
+    }

-    onRoomStateEvents: function(ev) {
+    // TODO: type when js-sdk has types
+    private onRoomStateEvents = (ev: any) => {
        if (!this.props.room ||
            ev.getRoomId() !== this.props.room.roomId ||
            ev.getType() !== 'm.room.avatar'
        ) return;

        this.setState({
-            urls: this.getImageUrls(this.props),
+            urls: RoomAvatar.getImageUrls(this.props),
        });
-    },
+    };

-    getImageUrls: function(props) {
+    private static getImageUrls(props: IProps): string[] {
        return [
            getHttpUriForMxc(
                MatrixClientPeg.get().getHomeserverUrl(),
+                // Default props don't play nicely with getDerivedStateFromProps
+                //props.oobData !== undefined ? props.oobData.avatarUrl : {},
                props.oobData.avatarUrl,
                Math.floor(props.width * window.devicePixelRatio),
                Math.floor(props.height * window.devicePixelRatio),
                props.resizeMethod,
            ), // highest priority
-            this.getRoomAvatarUrl(props),
+            RoomAvatar.getRoomAvatarUrl(props),
        ].filter(function(url) {
-            return (url != null && url != "");
+            return (url !== null && url !== "");
        });
-    },
+    }

-    getRoomAvatarUrl: function(props) {
+    private static getRoomAvatarUrl(props: IProps): string {
        if (!props.room) return null;

        return Avatar.avatarUrlForRoom(
@ -105,24 +111,21 @@ export default createReactClass({
            Math.floor(props.height * window.devicePixelRatio),
            props.resizeMethod,
        );
-    },
+    }

-    onRoomAvatarClick: function() {
+    private onRoomAvatarClick = () => {
        const avatarUrl = this.props.room.getAvatarUrl(
            MatrixClientPeg.get().getHomeserverUrl(),
            null, null, null, false);
-        const ImageView = sdk.getComponent("elements.ImageView");
        const params = {
            src: avatarUrl,
            name: this.props.room.name,
        };

        Modal.createDialog(ImageView, params, "mx_Dialog_lightbox");
-    },
-
-    render: function() {
-        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
+    };

+    public render() {
        /*eslint no-unused-vars: ["error", { "ignoreRestSiblings": true }]*/
        const {room, oobData, viewAvatarOnClick, ...otherProps} = this.props;

@ -132,8 +135,8 @@ export default createReactClass({
            <BaseAvatar {...otherProps} name={roomName}
                idName={room ? room.roomId : null}
                urls={this.state.urls}
-                onClick={this.props.viewAvatarOnClick ? this.onRoomAvatarClick : null}
-                disabled={!this.state.urls[0]} />
+                onClick={this.props.viewAvatarOnClick && !this.state.urls[0] ? this.onRoomAvatarClick : null}
+            />
        );
-    },
-});
+    }
+}
--- a/src/components/views/elements/AccessibleButton.tsx
+++ b/src/components/views/elements/AccessibleButton.tsx
@ -64,7 +64,6 @@ export default function AccessibleButton({
    className,
    ...restProps
 }: IProps) {
-
    const newProps: IAccessibleButtonProps = restProps;
    if (!disabled) {
        newProps.onClick = onClick;
--- a/src/components/views/elements/MemberEventListSummary.js
+++ b/src/components/views/elements/MemberEventListSummary.js
@ -1,6 +1,6 @@
 /*
 Copyright 2016 OpenMarket Ltd
-Copyright 2019 The Matrix.org Foundation C.I.C.
+Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
 Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>

 Licensed under the Apache License, Version 2.0 (the "License");
@ -23,6 +23,7 @@ import { _t } from '../../../languageHandler';
 import { formatCommaSeparatedList } from '../../../utils/FormattingUtils';
 import * as sdk from "../../../index";
 import {MatrixEvent} from "matrix-js-sdk";
+import {isValid3pidInvite} from "../../../RoomInvite";

 export default createReactClass({
    displayName: 'MemberEventListSummary',
@ -284,6 +285,9 @@ export default createReactClass({
    _getTransition: function(e) {
        if (e.mxEvent.getType() === 'm.room.third_party_invite') {
            // Handle 3pid invites the same as invites so they get bundled together
+            if (!isValid3pidInvite(e.mxEvent)) {
+                return 'invite_withdrawal';
+            }
            return 'invited';
        }

--- a/src/components/views/rooms/JumpToBottomButton.js
+++ b/src/components/views/rooms/JumpToBottomButton.js
@ -16,13 +16,18 @@ limitations under the License.

 import { _t } from '../../../languageHandler';
 import AccessibleButton from '../elements/AccessibleButton';
+import classNames from 'classnames';

 export default (props) => {
+    const className = classNames({
+        'mx_JumpToBottomButton': true,
+        'mx_JumpToBottomButton_highlight': props.highlight,
+    });
    let badge;
    if (props.numUnreadMessages) {
        badge = (<div className="mx_JumpToBottomButton_badge">{props.numUnreadMessages}</div>);
    }
-    return (<div className="mx_JumpToBottomButton">
+    return (<div className={className}>
        <AccessibleButton className="mx_JumpToBottomButton_scrollDown"
            title={_t("Scroll to most recent messages")}
            onClick={props.onScrollToBottomClick}>
--- a/src/components/views/rooms/NotificationBadge.tsx
+++ b/src/components/views/rooms/NotificationBadge.tsx
@ -22,11 +22,10 @@ import { DefaultTagID, TagID } from "../../../stores/room-list/models";
 import { readReceiptChangeIsFor } from "../../../utils/read-receipts";
 import AccessibleButton from "../elements/AccessibleButton";
 import { XOR } from "../../../@types/common";
-import { INotificationState, NOTIFICATION_STATE_UPDATE } from "../../../stores/notifications/INotificationState";
-import { NotificationColor } from "../../../stores/notifications/NotificationColor";
+import { NOTIFICATION_STATE_UPDATE, NotificationState } from "../../../stores/notifications/NotificationState";

 interface IProps {
-    notification: INotificationState;
+    notification: NotificationState;

    /**
     * If true, the badge will show a count if at all possible. This is typically
@ -97,19 +96,17 @@ export default class NotificationBadge extends React.PureComponent<XOR<IProps, I
        const {notification, forceCount, roomId, onClick, ...props} = this.props;

        // Don't show a badge if we don't need to
-        if (notification.color <= NotificationColor.None) return null;
+        if (notification.isIdle) return null;

        // TODO: Update these booleans for FTUE Notifications: https://github.com/vector-im/riot-web/issues/14261
        // As of writing, that is "if red, show count always" and "optionally show counts instead of dots".
        // See git diff for what that boolean state looks like.
        // XXX: We ignore this.state.showCounts (the setting which controls counts vs dots).
-        const hasNotif = notification.color >= NotificationColor.Red;
-        const hasCount = notification.color >= NotificationColor.Grey;
        const hasAnySymbol = notification.symbol || notification.count > 0;
-        let isEmptyBadge = !hasAnySymbol || !hasCount;
+        let isEmptyBadge = !hasAnySymbol || !notification.hasUnreadCount;
        if (forceCount) {
            isEmptyBadge = false;
-            if (!hasCount) return null; // Can't render a badge
+            if (!notification.hasUnreadCount) return null; // Can't render a badge
        }

        let symbol = notification.symbol || formatMinimalBadgeCount(notification.count);
@ -117,8 +114,8 @@ export default class NotificationBadge extends React.PureComponent<XOR<IProps, I

        const classes = classNames({
            'mx_NotificationBadge': true,
-            'mx_NotificationBadge_visible': isEmptyBadge ? true : hasCount,
-            'mx_NotificationBadge_highlighted': hasNotif,
+            'mx_NotificationBadge_visible': isEmptyBadge ? true : notification.hasUnreadCount,
+            'mx_NotificationBadge_highlighted': notification.hasMentions,
            'mx_NotificationBadge_dot': isEmptyBadge,
            'mx_NotificationBadge_2char': symbol.length > 0 && symbol.length < 3,
            'mx_NotificationBadge_3char': symbol.length > 2,
--- a/src/components/views/rooms/RoomBreadcrumbs2.tsx
+++ b/src/components/views/rooms/RoomBreadcrumbs2.tsx
@ -16,7 +16,6 @@ limitations under the License.

 import React from "react";
 import { BreadcrumbsStore } from "../../../stores/BreadcrumbsStore";
-import AccessibleButton from "../elements/AccessibleButton";
 import DecoratedRoomAvatar from "../avatars/DecoratedRoomAvatar";
 import { _t } from "../../../languageHandler";
 import { Room } from "matrix-js-sdk/src/models/room";
@ -92,9 +91,6 @@ export default class RoomBreadcrumbs2 extends React.PureComponent<IProps, IState
    };

    public render(): React.ReactElement {
-        // TODO: Decorate crumbs with icons: https://github.com/vector-im/riot-web/issues/14040
-        // TODO: Scrolling: https://github.com/vector-im/riot-web/issues/14040
-        // TODO: Tooltips: https://github.com/vector-im/riot-web/issues/14040
        const tiles = BreadcrumbsStore.instance.rooms.map((r, i) => {
            const roomTags = RoomListStore.instance.getTagsForRoom(r);
            const roomTag = roomTags.includes(DefaultTagID.DM) ? DefaultTagID.DM : roomTags[0];
--- a/src/components/views/rooms/RoomList2.tsx
+++ b/src/components/views/rooms/RoomList2.tsx
@ -32,15 +32,14 @@ import defaultDispatcher from "../../../dispatcher/dispatcher";
 import RoomSublist2 from "./RoomSublist2";
 import { ActionPayload } from "../../../dispatcher/payloads";
 import { NameFilterCondition } from "../../../stores/room-list/filters/NameFilterCondition";
-import { ListLayout } from "../../../stores/room-list/ListLayout";
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
 import GroupAvatar from "../avatars/GroupAvatar";
 import TemporaryTile from "./TemporaryTile";
 import { StaticNotificationState } from "../../../stores/notifications/StaticNotificationState";
 import { NotificationColor } from "../../../stores/notifications/NotificationColor";
-import { TagSpecificNotificationState } from "../../../stores/notifications/TagSpecificNotificationState";
 import { Action } from "../../../dispatcher/actions";
 import { ViewRoomDeltaPayload } from "../../../dispatcher/payloads/ViewRoomDeltaPayload";
+import { RoomNotificationStateStore } from "../../../stores/notifications/RoomNotificationStateStore";

 // TODO: Remove banner on launch: https://github.com/vector-im/riot-web/issues/14231
 // TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
@ -66,7 +65,6 @@ interface IProps {

 interface IState {
    sublists: ITagMap;
-    layouts: Map<TagID, ListLayout>;
 }

 const TAG_ORDER: TagID[] = [
@ -151,7 +149,6 @@ export default class RoomList2 extends React.Component<IProps, IState> {

        this.state = {
            sublists: {},
-            layouts: new Map<TagID, ListLayout>(),
        };

        this.dispatcherRef = defaultDispatcher.register(this.onAction);
@ -215,14 +212,11 @@ export default class RoomList2 extends React.Component<IProps, IState> {
            let listRooms = lists[t];

            if (unread) {
-                // TODO Be smarter and not spin up a bunch of wasted listeners just to kill them 4 lines later
-                // https://github.com/vector-im/riot-web/issues/14035
-                const notificationStates = rooms.map(r => new TagSpecificNotificationState(r, t));
                // filter to only notification rooms (and our current active room so we can index properly)
-                listRooms = notificationStates.filter(state => {
-                    return state.room.roomId === roomId || state.color >= NotificationColor.Bold;
+                listRooms = listRooms.filter(r => {
+                    const state = RoomNotificationStateStore.instance.getRoomState(r, t);
+                    return state.room.roomId === roomId || state.isUnread;
                });
-                notificationStates.forEach(state => state.destroy());
            }

            rooms.push(...listRooms);
@ -238,12 +232,7 @@ export default class RoomList2 extends React.Component<IProps, IState> {
        const newLists = RoomListStore.instance.orderedLists;
        console.log("new lists", newLists);

-        const layoutMap = new Map<TagID, ListLayout>();
-        for (const tagId of Object.keys(newLists)) {
-            layoutMap.set(tagId, new ListLayout(tagId));
-        }
-
-        this.setState({sublists: newLists, layouts: layoutMap}, () => {
+        this.setState({sublists: newLists}, () => {
            this.props.onResize();
        });
    };
@ -312,8 +301,6 @@ export default class RoomList2 extends React.Component<IProps, IState> {
                    label={_t(aesthetics.sectionLabel)}
                    onAddRoom={onAddRoomFn}
                    addRoomLabel={aesthetics.addRoomLabel}
-                    isInvite={aesthetics.isInvite}
-                    layout={this.state.layouts.get(orderedTagId)}
                    isMinimized={this.props.isMinimized}
                    onResize={this.props.onResize}
                    extraBadTilesThatShouldntExist={extraTiles}
--- a/src/components/views/rooms/RoomSublist2.tsx
+++ b/src/components/views/rooms/RoomSublist2.tsx
@ -24,9 +24,9 @@ import {RovingAccessibleButton, RovingTabIndexWrapper} from "../../../accessibil
 import { _t } from "../../../languageHandler";
 import AccessibleButton from "../../views/elements/AccessibleButton";
 import RoomTile2 from "./RoomTile2";
-import { ResizableBox, ResizeCallbackData } from "react-resizable";
 import { ListLayout } from "../../../stores/room-list/ListLayout";
 import {
+    ChevronFace,
    ContextMenu,
    ContextMenuButton,
    StyledMenuItemCheckbox,
@ -40,7 +40,13 @@ import NotificationBadge from "./NotificationBadge";
 import { ListNotificationState } from "../../../stores/notifications/ListNotificationState";
 import AccessibleTooltipButton from "../elements/AccessibleTooltipButton";
 import { Key } from "../../../Keyboard";
-import StyledCheckbox from "../elements/StyledCheckbox";
+import defaultDispatcher from "../../../dispatcher/dispatcher";
+import {ActionPayload} from "../../../dispatcher/payloads";
+import { Enable, Resizable } from "re-resizable";
+import { Direction } from "re-resizable/lib/resizer";
+import { polyfillTouchEvent } from "../../../@types/polyfill";
+import { RoomNotificationStateStore } from "../../../stores/notifications/RoomNotificationStateStore";
+import RoomListLayoutStore from "../../../stores/room-list/RoomListLayoutStore";

 // TODO: Remove banner on launch: https://github.com/vector-im/riot-web/issues/14231
 // TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
@ -55,9 +61,13 @@ import StyledCheckbox from "../elements/StyledCheckbox";

 const SHOW_N_BUTTON_HEIGHT = 32; // As defined by CSS
 const RESIZE_HANDLE_HEIGHT = 4; // As defined by CSS
+export const HEADER_HEIGHT = 32; // As defined by CSS

 const MAX_PADDING_HEIGHT = SHOW_N_BUTTON_HEIGHT + RESIZE_HANDLE_HEIGHT;

+// HACK: We really shouldn't have to do this.
+polyfillTouchEvent();
+
 interface IProps {
    forRooms: boolean;
    rooms?: Room[];
@ -65,8 +75,6 @@ interface IProps {
    label: string;
    onAddRoom?: () => void;
    addRoomLabel: string;
-    isInvite: boolean;
-    layout?: ListLayout;
    isMinimized: boolean;
    tagId: TagID;
    onResize: () => void;
@ -89,16 +97,21 @@ interface IState {
 export default class RoomSublist2 extends React.Component<IProps, IState> {
    private headerButton = createRef<HTMLDivElement>();
    private sublistRef = createRef<HTMLDivElement>();
+    private dispatcherRef: string;
+    private layout: ListLayout;

    constructor(props: IProps) {
        super(props);

+        this.layout = RoomListLayoutStore.instance.getLayoutFor(this.props.tagId);
+
        this.state = {
-            notificationState: new ListNotificationState(this.props.isInvite, this.props.tagId),
+            notificationState: RoomNotificationStateStore.instance.getListState(this.props.tagId),
            contextMenuPosition: null,
            isResizing: false,
        };
        this.state.notificationState.setRooms(this.props.rooms);
+        this.dispatcherRef = defaultDispatcher.register(this.onAction);
    }

    private get numTiles(): number {
@ -106,8 +119,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
    }

    private get numVisibleTiles(): number {
-        if (!this.props.layout) return 0;
-        const nVisible = Math.floor(this.props.layout.visibleTiles);
+        const nVisible = Math.floor(this.layout.visibleTiles);
        return Math.min(nVisible, this.numTiles);
    }

@ -117,17 +129,53 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

    public componentWillUnmount() {
        this.state.notificationState.destroy();
+        defaultDispatcher.unregister(this.dispatcherRef);
    }

+    private onAction = (payload: ActionPayload) => {
+        if (payload.action === "view_room" && payload.show_room_tile && this.props.rooms) {
+            // XXX: we have to do this a tick later because we have incorrect intermediate props during a room change
+            // where we lose the room we are changing from temporarily and then it comes back in an update right after.
+            setImmediate(() => {
+                const isCollapsed = this.layout.isCollapsed;
+                const roomIndex = this.props.rooms.findIndex((r) => r.roomId === payload.room_id);
+
+                if (isCollapsed && roomIndex > -1) {
+                    this.toggleCollapsed();
+                }
+                // extend the visible section to include the room if it is entirely invisible
+                if (roomIndex >= this.numVisibleTiles) {
+                    this.layout.visibleTiles = this.layout.tilesWithPadding(roomIndex + 1, MAX_PADDING_HEIGHT);
+                    this.forceUpdate(); // because the layout doesn't trigger a re-render
+                }
+            });
+        }
+    };
+
    private onAddRoom = (e) => {
        e.stopPropagation();
        if (this.props.onAddRoom) this.props.onAddRoom();
    };

-    private onResize = (e: React.MouseEvent, data: ResizeCallbackData) => {
-        const direction = e.movementY < 0 ? -1 : +1;
-        const tileDiff = this.props.layout.pixelsToTiles(Math.abs(e.movementY)) * direction;
-        this.props.layout.setVisibleTilesWithin(tileDiff, this.numTiles);
+    private onResize = (
+        e: MouseEvent | TouchEvent,
+        travelDirection: Direction,
+        refToElement: HTMLDivElement,
+        delta: { width: number, height: number }, // TODO: Use re-resizer's NumberSize when it is exposed as the type
+    ) => {
+        // Do some sanity checks, but in reality we shouldn't need these.
+        if (travelDirection !== "bottom") return;
+        if (delta.height === 0) return; // something went wrong, so just ignore it.
+
+        // NOTE: the movement in the MouseEvent (not present on a TouchEvent) is inaccurate
+        // for our purposes. The delta provided by the library is also a change *from when
+        // resizing started*, meaning it is fairly useless for us. This is why we just use
+        // the client height and run with it.
+
+        const heightBefore = this.layout.visibleTiles;
+        const heightInTiles = this.layout.pixelsToTiles(refToElement.clientHeight);
+        this.layout.setVisibleTilesWithin(heightInTiles, this.numTiles);
+        if (heightBefore === this.layout.visibleTiles) return; // no-op
        this.forceUpdate(); // because the layout doesn't trigger a re-render
    };

@ -141,13 +189,13 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

    private onShowAllClick = () => {
        const numVisibleTiles = this.numVisibleTiles;
-        this.props.layout.visibleTiles = this.props.layout.tilesWithPadding(this.numTiles, MAX_PADDING_HEIGHT);
+        this.layout.visibleTiles = this.layout.tilesWithPadding(this.numTiles, MAX_PADDING_HEIGHT);
        this.forceUpdate(); // because the layout doesn't trigger a re-render
        setImmediate(this.focusRoomTile, numVisibleTiles); // focus the tile after the current bottom one
    };

    private onShowLessClick = () => {
-        this.props.layout.visibleTiles = this.props.layout.defaultVisibleTiles;
+        this.layout.visibleTiles = this.layout.defaultVisibleTiles;
        this.forceUpdate(); // because the layout doesn't trigger a re-render
        // focus will flow to the show more button here
    };
@ -161,7 +209,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
        }
    };

-    private onOpenMenuClick = (ev: InputEvent) => {
+    private onOpenMenuClick = (ev: React.MouseEvent) => {
        ev.preventDefault();
        ev.stopPropagation();
        const target = ev.target as HTMLButtonElement;
@ -195,7 +243,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
    };

    private onMessagePreviewChanged = () => {
-        this.props.layout.showPreviews = !this.props.layout.showPreviews;
+        this.layout.showPreviews = !this.layout.showPreviews;
        this.forceUpdate(); // because the layout doesn't trigger a re-render
    };

@ -233,7 +281,11 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

        const possibleSticky = target.parentElement;
        const sublist = possibleSticky.parentElement.parentElement;
-        if (possibleSticky.classList.contains('mx_RoomSublist2_headerContainer_sticky')) {
+        const list = sublist.parentElement.parentElement;
+        // the scrollTop is capped at the height of the header in LeftPanel2
+        const isAtTop = list.scrollTop <= HEADER_HEIGHT;
+        const isSticky = possibleSticky.classList.contains('mx_RoomSublist2_headerContainer_sticky');
+        if (isSticky && !isAtTop) {
            // is sticky - jump to list
            sublist.scrollIntoView({behavior: 'smooth'});
        } else {
@ -243,13 +295,13 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
    };

    private toggleCollapsed = () => {
-        this.props.layout.isCollapsed = !this.props.layout.isCollapsed;
+        this.layout.isCollapsed = !this.layout.isCollapsed;
        this.forceUpdate(); // because the layout doesn't trigger an update
        setImmediate(() => this.props.onResize()); // needs to happen when the DOM is updated
    };

    private onHeaderKeyDown = (ev: React.KeyboardEvent) => {
-        const isCollapsed = this.props.layout && this.props.layout.isCollapsed;
+        const isCollapsed = this.layout && this.layout.isCollapsed;
        switch (ev.key) {
            case Key.ARROW_LEFT:
                ev.stopPropagation();
@ -289,7 +341,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
    };

    private renderVisibleTiles(): React.ReactElement[] {
-        if (this.props.layout && this.props.layout.isCollapsed) {
+        if (this.layout && this.layout.isCollapsed) {
            // don't waste time on rendering
            return [];
        }
@ -303,7 +355,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
                    <RoomTile2
                        room={room}
                        key={`room-${room.roomId}`}
-                        showMessagePreview={this.props.layout.showPreviews}
+                        showMessagePreview={this.layout.showPreviews}
                        isMinimized={this.props.isMinimized}
                        tag={this.props.tagId}
                    />
@ -354,7 +406,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
                            <StyledMenuItemCheckbox
                                onClose={this.onCloseMenu}
                                onChange={this.onMessagePreviewChanged}
-                                checked={this.props.layout.showPreviews}
+                                checked={this.layout.showPreviews}
                            >
                                {_t("Message preview")}
                            </StyledMenuItemCheckbox>
@ -365,7 +417,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

            contextMenu = (
                <ContextMenu
-                    chevronFace="none"
+                    chevronFace={ChevronFace.None}
                    left={this.state.contextMenuPosition.left}
                    top={this.state.contextMenuPosition.top + this.state.contextMenuPosition.height}
                    onFinished={this.onCloseMenu}
@ -446,7 +498,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

                    const collapseClasses = classNames({
                        'mx_RoomSublist2_collapseBtn': true,
-                        'mx_RoomSublist2_collapseBtn_collapsed': this.props.layout && this.props.layout.isCollapsed,
+                        'mx_RoomSublist2_collapseBtn_collapsed': this.layout && this.layout.isCollapsed,
                    });

                    const classes = classNames({
@ -474,7 +526,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
                                    tabIndex={tabIndex}
                                    className="mx_RoomSublist2_headerText"
                                    role="treeitem"
-                                    aria-expanded={!this.props.layout || !this.props.layout.isCollapsed}
+                                    aria-expanded={!this.layout.isCollapsed}
                                    aria-level={1}
                                    onClick={this.onHeaderClick}
                                    onContextMenu={this.onContextMenu}
@ -508,12 +560,10 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {

        let content = null;
        if (visibleTiles.length > 0) {
-            const layout = this.props.layout; // to shorten calls
+            const layout = this.layout; // to shorten calls

-            const maxTilesFactored = layout.tilesWithResizerBoxFactor(this.numTiles);
            const showMoreBtnClasses = classNames({
                'mx_RoomSublist2_showNButton': true,
-                'mx_RoomSublist2_isCutting': this.state.isResizing && layout.visibleTiles < maxTilesFactored,
            });

            // If we're hiding rooms, show a 'show more' button to the user. This button
@ -537,7 +587,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
                        {showMoreText}
                    </RovingAccessibleButton>
                );
-            } else if (this.numTiles <= visibleTiles.length && this.numTiles > this.props.layout.defaultVisibleTiles) {
+            } else if (this.numTiles <= visibleTiles.length && this.numTiles > this.layout.defaultVisibleTiles) {
                // we have all tiles visible - add a button to show less
                let showLessText = (
                    <span className='mx_RoomSublist2_showNButtonText'>
@ -556,9 +606,19 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
            }

            // Figure out if we need a handle
-            let handles = ['s'];
+            const handles: Enable = {
+                bottom: true, // the only one we need, but the others must be explicitly false
+                bottomLeft: false,
+                bottomRight: false,
+                left: false,
+                right: false,
+                top: false,
+                topLeft: false,
+                topRight: false,
+            };
            if (layout.visibleTiles >= this.numTiles && this.numTiles <= layout.minVisibleTiles) {
-                handles = []; // no handles, we're at a minimum
+                // we're at a minimum, don't have a bottom handle
+                handles.bottom = false;
            }

            // We have to account for padding so we can accommodate a 'show more' button and
@ -582,22 +642,33 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
            const tilesWithoutPadding = Math.min(relativeTiles, layout.visibleTiles);
            const tilesPx = layout.calculateTilesToPixelsMin(relativeTiles, tilesWithoutPadding, padding);

+            // Now that we know our padding constraints, let's find out if we need to chop off the
+            // last rendered visible tile so it doesn't collide with the 'show more' button
+            let visibleUnpaddedTiles = Math.round(layout.visibleTiles - layout.pixelsToTiles(padding));
+            if (visibleUnpaddedTiles === visibleTiles.length - 1) {
+                const placeholder = <div className="mx_RoomSublist2_placeholder" key='placeholder' />;
+                visibleTiles.splice(visibleUnpaddedTiles, 1, placeholder);
+            }
+
+            const dimensions = {
+                height: tilesPx,
+            };
            content = (
-                <ResizableBox
-                    width={-1}
-                    height={tilesPx}
-                    axis="y"
-                    minConstraints={[-1, minTilesPx]}
-                    maxConstraints={[-1, maxTilesPx]}
-                    resizeHandles={handles}
-                    onResize={this.onResize}
-                    className="mx_RoomSublist2_resizeBox"
+                <Resizable
+                    size={dimensions as any}
+                    minHeight={minTilesPx}
+                    maxHeight={maxTilesPx}
                    onResizeStart={this.onResizeStart}
                    onResizeStop={this.onResizeStop}
+                    onResize={this.onResize}
+                    handleWrapperClass="mx_RoomSublist2_resizerHandles"
+                    handleClasses={{bottom: "mx_RoomSublist2_resizerHandle"}}
+                    className="mx_RoomSublist2_resizeBox"
+                    enable={handles}
                >
                    {visibleTiles}
                    {showNButton}
-                </ResizableBox>
+                </Resizable>
            );
        }

--- a/src/components/views/rooms/RoomTile2.tsx
+++ b/src/components/views/rooms/RoomTile2.tsx
@ -17,7 +17,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import React from "react";
+import React, {createRef} from "react";
 import { Room } from "matrix-js-sdk/src/models/room";
 import classNames from "classnames";
 import { RovingTabIndexWrapper } from "../../../accessibility/RovingTabIndex";
@ -27,6 +27,7 @@ import { Key } from "../../../Keyboard";
 import ActiveRoomObserver from "../../../ActiveRoomObserver";
 import { _t } from "../../../languageHandler";
 import {
+    ChevronFace,
    ContextMenu,
    ContextMenuButton,
    MenuItemRadio,
@ -45,11 +46,14 @@ import {
    MUTE,
 } from "../../../RoomNotifs";
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
-import { TagSpecificNotificationState } from "../../../stores/notifications/TagSpecificNotificationState";
-import { INotificationState } from "../../../stores/notifications/INotificationState";
 import NotificationBadge from "./NotificationBadge";
-import { NotificationColor } from "../../../stores/notifications/NotificationColor";
 import { Volume } from "../../../RoomNotifsTypes";
+import RoomListStore from "../../../stores/room-list/RoomListStore2";
+import RoomListActions from "../../../actions/RoomListActions";
+import defaultDispatcher from "../../../dispatcher/dispatcher";
+import {ActionPayload} from "../../../dispatcher/payloads";
+import { RoomNotificationStateStore } from "../../../stores/notifications/RoomNotificationStateStore";
+import { NotificationState } from "../../../stores/notifications/NotificationState";

 // TODO: Remove banner on launch: https://github.com/vector-im/riot-web/issues/14231
 // TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
@ -75,7 +79,7 @@ type PartialDOMRect = Pick<DOMRect, "left" | "bottom">;

 interface IState {
    hover: boolean;
-    notificationState: INotificationState;
+    notificationState: NotificationState;
    selected: boolean;
    notificationsMenuPosition: PartialDOMRect;
    generalMenuPosition: PartialDOMRect;
@ -87,7 +91,7 @@ const contextMenuBelow = (elementRect: PartialDOMRect) => {
    // align the context menu's icons with the icon which opened the context menu
    const left = elementRect.left + window.pageXOffset - 9;
    const top = elementRect.bottom + window.pageYOffset + 17;
-    const chevronFace = "none";
+    const chevronFace = ChevronFace.None;
    return {left, top, chevronFace};
 };

@ -118,18 +122,23 @@ const NotifOption: React.FC<INotifOptionProps> = ({active, onClick, iconClassNam
 };

 export default class RoomTile2 extends React.Component<IProps, IState> {
+    private dispatcherRef: string;
+    private roomTileRef = createRef<HTMLDivElement>();
+    // TODO: a11y: https://github.com/vector-im/riot-web/issues/14180
+
    constructor(props: IProps) {
        super(props);

        this.state = {
            hover: false,
-            notificationState: new TagSpecificNotificationState(this.props.room, this.props.tag),
+            notificationState: RoomNotificationStateStore.instance.getRoomState(this.props.room, this.props.tag),
            selected: ActiveRoomObserver.activeRoomId === this.props.room.roomId,
            notificationsMenuPosition: null,
            generalMenuPosition: null,
        };

        ActiveRoomObserver.addListener(this.props.room.roomId, this.onActiveRoomUpdate);
+        this.dispatcherRef = defaultDispatcher.register(this.onAction);
    }

    private get showContextMenu(): boolean {
@ -140,12 +149,36 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        return !this.props.isMinimized && this.props.showMessagePreview;
    }

+    public componentDidMount() {
+        // when we're first rendered (or our sublist is expanded) make sure we are visible if we're active
+        if (this.state.selected) {
+            this.scrollIntoView();
+        }
+    }
+
    public componentWillUnmount() {
        if (this.props.room) {
            ActiveRoomObserver.removeListener(this.props.room.roomId, this.onActiveRoomUpdate);
        }
+        defaultDispatcher.unregister(this.dispatcherRef);
    }

+    private onAction = (payload: ActionPayload) => {
+        if (payload.action === "view_room" && payload.room_id === this.props.room.roomId && payload.show_room_tile) {
+            setImmediate(() => {
+                this.scrollIntoView();
+            });
+        }
+    };
+
+    private scrollIntoView = () => {
+        if (!this.roomTileRef.current) return;
+        this.roomTileRef.current.scrollIntoView({
+            block: "nearest",
+            behavior: "auto",
+        });
+    };
+
    private onTileMouseEnter = () => {
        this.setState({hover: true});
    };
@ -159,7 +192,6 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        ev.stopPropagation();
        dis.dispatch({
            action: 'view_room',
-            // TODO: Support show_room_tile in new room list: https://github.com/vector-im/riot-web/issues/14233
            show_room_tile: true, // make sure the room is visible in the list
            room_id: this.props.room.roomId,
            clear_search: (ev && (ev.key === Key.ENTER || ev.key === Key.SPACE)),
@ -170,7 +202,7 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        this.setState({selected: isActive});
    };

-    private onNotificationsMenuOpenClick = (ev: InputEvent) => {
+    private onNotificationsMenuOpenClick = (ev: React.MouseEvent) => {
        ev.preventDefault();
        ev.stopPropagation();
        const target = ev.target as HTMLButtonElement;
@ -181,7 +213,7 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        this.setState({notificationsMenuPosition: null});
    };

-    private onGeneralMenuOpenClick = (ev: InputEvent) => {
+    private onGeneralMenuOpenClick = (ev: React.MouseEvent) => {
        ev.preventDefault();
        ev.stopPropagation();
        const target = ev.target as HTMLButtonElement;
@ -210,8 +242,22 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        ev.preventDefault();
        ev.stopPropagation();

-        // TODO: Support tagging: https://github.com/vector-im/riot-web/issues/14211
-        // TODO: XOR favourites and low priority: https://github.com/vector-im/riot-web/issues/14210
+        if (tagId === DefaultTagID.Favourite) {
+            const roomTags = RoomListStore.instance.getTagsForRoom(this.props.room);
+            const isFavourite = roomTags.includes(DefaultTagID.Favourite);
+            const removeTag = isFavourite ? DefaultTagID.Favourite : DefaultTagID.LowPriority;
+            const addTag = isFavourite ? null : DefaultTagID.Favourite;
+            dis.dispatch(RoomListActions.tagRoom(
+                MatrixClientPeg.get(),
+                this.props.room,
+                removeTag,
+                addTag,
+                undefined,
+                0
+            ));
+        } else {
+            console.log(`Unexpected tag ${tagId} applied to ${this.props.room.room_id}`);
+        }

        if ((ev as React.KeyboardEvent).key === Key.ENTER) {
            // Implements https://www.w3.org/TR/wai-aria-practices/#keyboard-interaction-12
@ -343,6 +389,13 @@ export default class RoomTile2 extends React.Component<IProps, IState> {

        // TODO: We could do with a proper invite context menu, unlike what showContextMenu suggests

+        const roomTags = RoomListStore.instance.getTagsForRoom(this.props.room);
+
+        const isFavorite = roomTags.includes(DefaultTagID.Favourite);
+        const favouriteIconClassName = isFavorite ? "mx_RoomTile2_iconFavorite" : "mx_RoomTile2_iconStar";
+        const favouriteLabelClassName = isFavorite ? "mx_RoomTile2_contextMenu_activeRow" : "";
+        const favouriteLabel = isFavorite ? _t("Favourited") : _t("Favourite");
+
        let contextMenu = null;
        if (this.state.generalMenuPosition) {
            contextMenu = (
@ -350,12 +403,13 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
                    <div className="mx_IconizedContextMenu mx_IconizedContextMenu_compact mx_RoomTile2_contextMenu">
                        <div className="mx_IconizedContextMenu_optionList">
                            <MenuItemCheckbox
+                                className={favouriteLabelClassName}
                                onClick={(e) => this.onTagRoom(e, DefaultTagID.Favourite)}
-                                active={false} // TODO: https://github.com/vector-im/riot-web/issues/14283
-                                label={_t("Favourite")}
+                                active={isFavorite}
+                                label={favouriteLabel}
                            >
-                                <span className="mx_IconizedContextMenu_icon mx_RoomTile2_iconStar" />
-                                <span className="mx_IconizedContextMenu_label">{_t("Favourite")}</span>
+                                <span className={classNames("mx_IconizedContextMenu_icon", favouriteIconClassName)} />
+                                <span className="mx_IconizedContextMenu_label">{favouriteLabel}</span>
                            </MenuItemCheckbox>
                            <MenuItem onClick={this.onOpenRoomSettings} label={_t("Settings")}>
                                <span className="mx_IconizedContextMenu_icon mx_RoomTile2_iconSettings" />
@ -437,11 +491,10 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
            }
        }

-        const notificationColor = this.state.notificationState.color;
        const nameClasses = classNames({
            "mx_RoomTile2_name": true,
            "mx_RoomTile2_nameWithPreview": !!messagePreview,
-            "mx_RoomTile2_nameHasUnreadEvents": notificationColor >= NotificationColor.Bold,
+            "mx_RoomTile2_nameHasUnreadEvents": this.state.notificationState.isUnread,
        });

        let nameContainer = (
@ -458,15 +511,15 @@ export default class RoomTile2 extends React.Component<IProps, IState> {
        // The following labels are written in such a fashion to increase screen reader efficiency (speed).
        if (this.props.tag === DefaultTagID.Invite) {
            // append nothing
-        } else if (notificationColor >= NotificationColor.Red) {
+        } else if (this.state.notificationState.hasMentions) {
            ariaLabel += " " + _t("%(count)s unread messages including mentions.", {
                count: this.state.notificationState.count,
            });
-        } else if (notificationColor >= NotificationColor.Grey) {
+        } else if (this.state.notificationState.hasUnreadCount) {
            ariaLabel += " " + _t("%(count)s unread messages.", {
                count: this.state.notificationState.count,
            });
-        } else if (notificationColor >= NotificationColor.Bold) {
+        } else if (this.state.notificationState.isUnread) {
            ariaLabel += " " + _t("Unread messages.");
        }

@ -477,7 +530,7 @@ export default class RoomTile2 extends React.Component<IProps, IState> {

        return (
            <React.Fragment>
-                <RovingTabIndexWrapper>
+                <RovingTabIndexWrapper inputRef={this.roomTileRef}>
                    {({onFocus, isActive, ref}) =>
                        <AccessibleButton
                            onFocus={onFocus}
--- a/src/components/views/rooms/TemporaryTile.tsx
+++ b/src/components/views/rooms/TemporaryTile.tsx
@ -18,16 +18,15 @@ import React from "react";
 import classNames from "classnames";
 import { RovingTabIndexWrapper } from "../../../accessibility/RovingTabIndex";
 import AccessibleButton from "../../views/elements/AccessibleButton";
-import { INotificationState } from "../../../stores/notifications/INotificationState";
 import NotificationBadge from "./NotificationBadge";
-import { NotificationColor } from "../../../stores/notifications/NotificationColor";
+import { NotificationState } from "../../../stores/notifications/NotificationState";

 interface IProps {
    isMinimized: boolean;
    isSelected: boolean;
    displayName: string;
    avatar: React.ReactElement;
-    notificationState: INotificationState;
+    notificationState: NotificationState;
    onClick: () => void;
 }

@ -74,7 +73,7 @@ export default class TemporaryTile extends React.Component<IProps, IState> {

        const nameClasses = classNames({
            "mx_RoomTile2_name": true,
-            "mx_RoomTile2_nameHasUnreadEvents": this.props.notificationState.color >= NotificationColor.Bold,
+            "mx_RoomTile2_nameHasUnreadEvents": this.props.notificationState.isUnread,
        });

        let nameContainer = (
--- a/src/components/views/settings/tabs/room/AdvancedRoomSettingsTab.js
+++ b/src/components/views/settings/tabs/room/AdvancedRoomSettingsTab.js
@ -22,6 +22,10 @@ import * as sdk from "../../../../..";
 import AccessibleButton from "../../../elements/AccessibleButton";
 import Modal from "../../../../../Modal";
 import dis from "../../../../../dispatcher/dispatcher";
+import RoomListStore from "../../../../../stores/room-list/RoomListStore2";
+import RoomListActions from "../../../../../actions/RoomListActions";
+import { DefaultTagID } from '../../../../../stores/room-list/models';
+import LabelledToggleSwitch from '../../../elements/LabelledToggleSwitch';

 export default class AdvancedRoomSettingsTab extends React.Component {
    static propTypes = {
@ -29,12 +33,16 @@ export default class AdvancedRoomSettingsTab extends React.Component {
        closeSettingsFn: PropTypes.func.isRequired,
    };

-    constructor() {
-        super();
+    constructor(props) {
+        super(props);
+
+        const room = MatrixClientPeg.get().getRoom(props.roomId);
+        const roomTags = RoomListStore.instance.getTagsForRoom(room);

        this.state = {
            // This is eventually set to the value of room.getRecommendedVersion()
            upgradeRecommendation: null,
+            isLowPriorityRoom: roomTags.includes(DefaultTagID.LowPriority),
        };
    }

@ -86,6 +94,25 @@ export default class AdvancedRoomSettingsTab extends React.Component {
        this.props.closeSettingsFn();
    };

+    _onToggleLowPriorityTag = (e) => {
+        this.setState({
+            isLowPriorityRoom: !this.state.isLowPriorityRoom,
+        });
+
+        const removeTag = this.state.isLowPriorityRoom ? DefaultTagID.LowPriority : DefaultTagID.Favourite;
+        const addTag = this.state.isLowPriorityRoom ? null : DefaultTagID.LowPriority;
+        const client = MatrixClientPeg.get();
+
+        dis.dispatch(RoomListActions.tagRoom(
+            client,
+            client.getRoom(this.props.roomId),
+            removeTag,
+            addTag,
+            undefined,
+            0,
+        ));
+    }
+
    render() {
        const client = MatrixClientPeg.get();
        const room = client.getRoom(this.props.roomId);
@ -156,6 +183,17 @@ export default class AdvancedRoomSettingsTab extends React.Component {
                        {_t("Open Devtools")}
                    </AccessibleButton>
                </div>
+                <div className='mx_SettingsTab_section mx_SettingsTab_subsectionText'>
+                    <span className='mx_SettingsTab_subheading'>{_t('Make this room low priority')}</span>
+                    <LabelledToggleSwitch
+                        value={this.state.isLowPriorityRoom}
+                        onChange={this._onToggleLowPriorityTag}
+                        label={_t(
+                            "Low priority rooms show up at the bottom of your room list" +
+                            " in a dedicated section at the bottom of your room list",
+                        )}
+                    />
+                </div>
            </div>
        );
    }
--- a/src/components/views/settings/tabs/user/AppearanceUserSettingsTab.tsx
+++ b/src/components/views/settings/tabs/user/AppearanceUserSettingsTab.tsx
@ -402,6 +402,12 @@ export default class AppearanceUserSettingsTab extends React.Component<IProps, I
                    useCheckbox={true}
                    disabled={this.state.useIRCLayout}
                />
+                <SettingsFlag
+                    name="useIRCLayout"
+                    level={SettingLevel.DEVICE}
+                    useCheckbox={true}
+                    onChange={(checked) => this.setState({useIRCLayout: checked})}
+                />
                <SettingsFlag
                    name="useSystemFont"
                    level={SettingLevel.DEVICE}
@ -440,7 +446,6 @@ export default class AppearanceUserSettingsTab extends React.Component<IProps, I
                </div>
                {this.renderThemeSection()}
                {SettingsStore.isFeatureEnabled("feature_font_scaling") ? this.renderFontSection() : null}
-                {SettingsStore.isFeatureEnabled("feature_irc_ui") ? this.renderLayoutSection() : null}
                {this.renderAdvancedSection()}
            </div>
        );
--- a/src/components/views/voip/CallContainer.tsx
+++ b/src/components/views/voip/CallContainer.tsx
@ -0,0 +1,37 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import IncomingCallBox2 from './IncomingCallBox2';
+import CallPreview from './CallPreview2';
+import * as VectorConferenceHandler from '../../../VectorConferenceHandler';
+
+interface IProps {
+
+}
+
+interface IState {
+
+}
+
+export default class CallContainer extends React.PureComponent<IProps, IState> {
+    public render() {
+        return <div className="mx_CallContainer">
+            <IncomingCallBox2 />
+            <CallPreview ConferenceHandler={VectorConferenceHandler} />
+        </div>;
+    }
+}
--- a/src/components/views/voip/CallPreview2.tsx
+++ b/src/components/views/voip/CallPreview2.tsx
@ -0,0 +1,129 @@
+/*
+Copyright 2017, 2018 New Vector Ltd
+Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
+
+import React from 'react';
+
+import CallView from "./CallView2";
+import RoomViewStore from '../../../stores/RoomViewStore';
+import CallHandler from '../../../CallHandler';
+import dis from '../../../dispatcher/dispatcher';
+import { ActionPayload } from '../../../dispatcher/payloads';
+import PersistentApp from "../elements/PersistentApp";
+import SettingsStore from "../../../settings/SettingsStore";
+
+interface IProps {
+    // A Conference Handler implementation
+    // Must have a function signature:
+    //  getConferenceCallForRoom(roomId: string): MatrixCall
+    ConferenceHandler: any;
+}
+
+interface IState {
+    roomId: string;
+    activeCall: any;
+    newRoomListActive: boolean;
+}
+
+export default class CallPreview extends React.Component<IProps, IState> {
+    private roomStoreToken: any;
+    private dispatcherRef: string;
+    private settingsWatcherRef: string;
+
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {
+            roomId: RoomViewStore.getRoomId(),
+            activeCall: CallHandler.getAnyActiveCall(),
+            newRoomListActive: SettingsStore.getValue("feature_new_room_list"),
+        };
+
+        this.settingsWatcherRef = SettingsStore.watchSetting("feature_new_room_list", null, (name, roomId, level, valAtLevel, newVal) => this.setState({
+            newRoomListActive: newVal,
+        }));
+    }
+
+    public componentDidMount() {
+        this.roomStoreToken = RoomViewStore.addListener(this.onRoomViewStoreUpdate);
+        this.dispatcherRef = dis.register(this.onAction);
+    }
+
+    public componentWillUnmount() {
+        if (this.roomStoreToken) {
+            this.roomStoreToken.remove();
+        }
+        dis.unregister(this.dispatcherRef);
+        SettingsStore.unwatchSetting(this.settingsWatcherRef);
+    }
+
+    private onRoomViewStoreUpdate = (payload) => {
+        if (RoomViewStore.getRoomId() === this.state.roomId) return;
+        this.setState({
+            roomId: RoomViewStore.getRoomId(),
+        });
+    };
+
+    private onAction = (payload: ActionPayload) => {
+        switch (payload.action) {
+            // listen for call state changes to prod the render method, which
+            // may hide the global CallView if the call it is tracking is dead
+            case 'call_state':
+                this.setState({
+                    activeCall: CallHandler.getAnyActiveCall(),
+                });
+                break;
+        }
+    };
+
+    private onCallViewClick = () => {
+        const call = CallHandler.getAnyActiveCall();
+        if (call) {
+            dis.dispatch({
+                action: 'view_room',
+                room_id: call.groupRoomId || call.roomId,
+            });
+        }
+    };
+
+    public render() {
+        if (this.state.newRoomListActive) {
+            const callForRoom = CallHandler.getCallForRoom(this.state.roomId);
+            const showCall = (
+                this.state.activeCall &&
+                this.state.activeCall.call_state === 'connected' &&
+                !callForRoom
+            );
+
+            if (showCall) {
+                return (
+                    <CallView
+                        className="mx_CallPreview" onClick={this.onCallViewClick}
+                        ConferenceHandler={this.props.ConferenceHandler}
+                        showHangup={true}
+                    />
+                );
+            }
+
+            return <PersistentApp />;
+        }
+
+        return null;
+    }
+}
+
--- a/src/components/views/voip/CallView2.tsx
+++ b/src/components/views/voip/CallView2.tsx
@ -0,0 +1,200 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
+
+import React, {createRef} from 'react';
+import Room from 'matrix-js-sdk/src/models/room';
+import dis from '../../../dispatcher/dispatcher';
+import CallHandler from '../../../CallHandler';
+import {MatrixClientPeg} from '../../../MatrixClientPeg';
+import { _t } from '../../../languageHandler';
+import AccessibleButton from '../elements/AccessibleButton';
+import VideoView from "./VideoView";
+import RoomAvatar from "../avatars/RoomAvatar";
+import PulsedAvatar from '../avatars/PulsedAvatar';
+
+interface IProps {
+        // js-sdk room object. If set, we will only show calls for the given
+        // room; if not, we will show any active call.
+        room?: Room;
+
+        // A Conference Handler implementation
+        // Must have a function signature:
+        //  getConferenceCallForRoom(roomId: string): MatrixCall
+        ConferenceHandler?: any;
+
+        // maxHeight style attribute for the video panel
+        maxVideoHeight?: number;
+
+        // a callback which is called when the user clicks on the video div
+        onClick?: React.MouseEventHandler;
+
+        // a callback which is called when the content in the callview changes
+        // in a way that is likely to cause a resize.
+        onResize?: any;
+
+        // classname applied to view,
+        className?: string;
+
+        // Whether to show the hang up icon:W
+        showHangup?: boolean;
+}
+
+interface IState {
+    call: any;
+}
+
+export default class CallView extends React.Component<IProps, IState> {
+    private videoref: React.RefObject<any>;
+    private dispatcherRef: string;
+    public call: any;
+
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {
+            // the call this view is displaying (if any)
+            call: null,
+        };
+
+        this.videoref = createRef();
+    }
+
+    public componentDidMount() {
+        this.dispatcherRef = dis.register(this.onAction);
+        this.showCall();
+    }
+
+    public componentWillUnmount() {
+        dis.unregister(this.dispatcherRef);
+    }
+
+    private onAction = (payload) => {
+        // don't filter out payloads for room IDs other than props.room because
+        // we may be interested in the conf 1:1 room
+        if (payload.action !== 'call_state') {
+            return;
+        }
+        this.showCall();
+    };
+
+    private showCall() {
+        let call;
+
+        if (this.props.room) {
+            const roomId = this.props.room.roomId;
+            call = CallHandler.getCallForRoom(roomId) ||
+                (this.props.ConferenceHandler ?
+                 this.props.ConferenceHandler.getConferenceCallForRoom(roomId) :
+                 null
+                );
+
+            if (this.call) {
+                this.setState({ call: call });
+            }
+        } else {
+            call = CallHandler.getAnyActiveCall();
+            // Ignore calls if we can't get the room associated with them.
+            // I think the underlying problem is that the js-sdk sends events
+            // for calls before it has made the rooms available in the store,
+            // although this isn't confirmed.
+            if (MatrixClientPeg.get().getRoom(call.roomId) === null) {
+                call = null;
+            }
+            this.setState({ call: call });
+        }
+
+        if (call) {
+            call.setLocalVideoElement(this.getVideoView().getLocalVideoElement());
+            call.setRemoteVideoElement(this.getVideoView().getRemoteVideoElement());
+            // always use a separate element for audio stream playback.
+            // this is to let us move CallView around the DOM without interrupting remote audio
+            // during playback, by having the audio rendered by a top-level <audio/> element.
+            // rather than being rendered by the main remoteVideo <video/> element.
+            call.setRemoteAudioElement(this.getVideoView().getRemoteAudioElement());
+        }
+        if (call && call.type === "video" && call.call_state !== "ended" && call.call_state !== "ringing") {
+            // if this call is a conf call, don't display local video as the
+            // conference will have us in it
+            this.getVideoView().getLocalVideoElement().style.display = (
+                call.confUserId ? "none" : "block"
+            );
+            this.getVideoView().getRemoteVideoElement().style.display = "block";
+        } else {
+            this.getVideoView().getLocalVideoElement().style.display = "none";
+            this.getVideoView().getRemoteVideoElement().style.display = "none";
+            dis.dispatch({action: 'video_fullscreen', fullscreen: false});
+        }
+
+        if (this.props.onResize) {
+            this.props.onResize();
+        }
+    }
+
+    private getVideoView() {
+        return this.videoref.current;
+    }
+
+    public render() {
+        let view: React.ReactNode;
+        if (this.state.call && this.state.call.type === "voice") {
+            const client = MatrixClientPeg.get();
+            const callRoom = client.getRoom(this.state.call.roomId);
+
+            view = <AccessibleButton className="mx_CallView2_voice" onClick={this.props.onClick}>
+                <PulsedAvatar>
+                    <RoomAvatar
+                        room={callRoom}
+                        height={35}
+                        width={35}
+                    />
+                </PulsedAvatar>
+                <div>
+                    <h1>{callRoom.name}</h1>
+                    <p>{ _t("Active call") }</p>
+                </div>
+            </AccessibleButton>;
+        } else {
+            view = <VideoView
+                ref={this.videoref}
+                onClick={this.props.onClick}
+                onResize={this.props.onResize}
+                maxHeight={this.props.maxVideoHeight}
+            />;
+        }
+
+        let hangup: React.ReactNode;
+        if (this.props.showHangup) {
+            hangup = <div
+                className="mx_CallView2_hangup"
+                onClick={() => {
+                    dis.dispatch({
+                        action: 'hangup',
+                        room_id: this.state.call.roomId,
+                    });
+                }}
+            />;
+        }
+
+        return <div className={this.props.className}>
+            {view}
+            {hangup}
+        </div>;
+    }
+}
+
--- a/src/components/views/voip/IncomingCallBox2.tsx
+++ b/src/components/views/voip/IncomingCallBox2.tsx
@ -0,0 +1,141 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
+Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
+
+import React from 'react';
+import {MatrixClientPeg} from '../../../MatrixClientPeg';
+import dis from '../../../dispatcher/dispatcher';
+import { _t } from '../../../languageHandler';
+import { ActionPayload } from '../../../dispatcher/payloads';
+import CallHandler from '../../../CallHandler';
+import PulsedAvatar from '../avatars/PulsedAvatar';
+import RoomAvatar from '../avatars/RoomAvatar';
+import FormButton from '../elements/FormButton';
+
+interface IProps {
+}
+
+interface IState {
+    incomingCall: any;
+}
+
+export default class IncomingCallBox2 extends React.Component<IProps, IState> {
+    private dispatcherRef: string;
+
+    constructor(props: IProps) {
+        super(props);
+
+        this.dispatcherRef = dis.register(this.onAction);
+        this.state = {
+            incomingCall: null,
+        };
+    }
+
+    public componentWillUnmount() {
+        dis.unregister(this.dispatcherRef);
+    }
+
+    private onAction = (payload: ActionPayload) => {
+        switch (payload.action) {
+            case 'call_state':
+                const call = CallHandler.getCall(payload.room_id);
+                if (call && call.call_state === 'ringing') {
+                    this.setState({
+                        incomingCall: call,
+                    });
+                } else {
+                    this.setState({
+                        incomingCall: null,
+                    });
+                }
+        }
+    };
+
+    private onAnswerClick: React.MouseEventHandler = (e) => {
+        e.stopPropagation();
+        dis.dispatch({
+            action: 'answer',
+            room_id: this.state.incomingCall.roomId,
+        });
+    };
+
+    private onRejectClick: React.MouseEventHandler = (e) => {
+        e.stopPropagation();
+        dis.dispatch({
+            action: 'hangup',
+            room_id: this.state.incomingCall.roomId,
+        });
+    };
+
+    public render() {
+        if (!this.state.incomingCall) {
+            return null;
+        }
+
+        let room = null;
+        if (this.state.incomingCall) {
+            room = MatrixClientPeg.get().getRoom(this.state.incomingCall.roomId);
+        }
+
+        const caller = room ? room.name : _t("Unknown caller");
+
+        let incomingCallText = null;
+        if (this.state.incomingCall) {
+            if (this.state.incomingCall.type === "voice") {
+                incomingCallText = _t("Incoming voice call");
+            } else if (this.state.incomingCall.type === "video") {
+                incomingCallText = _t("Incoming video call");
+            } else {
+                incomingCallText = _t("Incoming call");
+            }
+        }
+
+        return <div className="mx_IncomingCallBox2">
+            <div className="mx_IncomingCallBox2_CallerInfo">
+                <PulsedAvatar>
+                    <RoomAvatar
+                        room={room}
+                        height={32}
+                        width={32}
+                    />
+                </PulsedAvatar>
+                <div>
+                    <h1>{caller}</h1>
+                    <p>{incomingCallText}</p>
+                </div>
+            </div>
+            <div className="mx_IncomingCallBox2_buttons">
+                <FormButton
+                    className={"mx_IncomingCallBox2_decline"}
+                    onClick={this.onRejectClick}
+                    kind="danger"
+                    label={_t("Decline")}
+                />
+                <div className="mx_IncomingCallBox2_spacer" />
+                <FormButton
+                    className={"mx_IncomingCallBox2_accept"}
+                    onClick={this.onAnswerClick}
+                    kind="primary"
+                    label={_t("Accept")}
+                />
+            </div>
+        </div>;
+    }
+}
+
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@ -489,7 +489,6 @@
    "Try out new ways to ignore people (experimental)": "Try out new ways to ignore people (experimental)",
    "Use the improved room list (will refresh to apply changes)": "Use the improved room list (will refresh to apply changes)",
    "Support adding custom themes": "Support adding custom themes",
-    "Enable IRC layout option in the appearance tab": "Enable IRC layout option in the appearance tab",
    "Show info about bridges in room settings": "Show info about bridges in room settings",
    "Font size": "Font size",
    "Use custom size": "Use custom size",
@ -539,7 +538,7 @@
    "How fast should messages be downloaded.": "How fast should messages be downloaded.",
    "Manually verify all remote sessions": "Manually verify all remote sessions",
    "IRC display name width": "IRC display name width",
-    "Use IRC layout": "Use IRC layout",
+    "Enable experimental, compact IRC style layout": "Enable experimental, compact IRC style layout",
    "Collecting app version information": "Collecting app version information",
    "Collecting logs": "Collecting logs",
    "Uploading report": "Uploading report",
@ -558,12 +557,17 @@
    "My Ban List": "My Ban List",
    "This is your list of users/servers you have blocked - don't leave the room!": "This is your list of users/servers you have blocked - don't leave the room!",
    "Active call (%(roomName)s)": "Active call (%(roomName)s)",
+    "Active call": "Active call",
    "unknown caller": "unknown caller",
    "Incoming voice call from %(name)s": "Incoming voice call from %(name)s",
    "Incoming video call from %(name)s": "Incoming video call from %(name)s",
    "Incoming call from %(name)s": "Incoming call from %(name)s",
    "Decline": "Decline",
    "Accept": "Accept",
+    "Unknown caller": "Unknown caller",
+    "Incoming voice call": "Incoming voice call",
+    "Incoming video call": "Incoming video call",
+    "Incoming call": "Incoming call",
    "The other party cancelled the verification.": "The other party cancelled the verification.",
    "Verified!": "Verified!",
    "You've successfully verified this user.": "You've successfully verified this user.",
@ -966,6 +970,8 @@
    "Room version:": "Room version:",
    "Developer options": "Developer options",
    "Open Devtools": "Open Devtools",
+    "Make this room low priority": "Make this room low priority",
+    "Low priority rooms show up at the bottom of your room list in a dedicated section at the bottom of your room list": "Low priority rooms show up at the bottom of your room list in a dedicated section at the bottom of your room list",
    "This room is bridging messages to the following platforms. <a>Learn more.</a>": "This room is bridging messages to the following platforms. <a>Learn more.</a>",
    "This room isn’t bridging messages to any platforms. <a>Learn more.</a>": "This room isn’t bridging messages to any platforms. <a>Learn more.</a>",
    "Bridges": "Bridges",
@ -1224,6 +1230,7 @@
    "All messages": "All messages",
    "Mentions & Keywords": "Mentions & Keywords",
    "Notification options": "Notification options",
+    "Favourited": "Favourited",
    "Favourite": "Favourite",
    "Leave Room": "Leave Room",
    "Room options": "Room options",
@ -2102,7 +2109,6 @@
    "%(count)s <resendText>Resend all</resendText> or <cancelText>cancel all</cancelText> now. You can also select individual messages to resend or cancel.|one": "<resendText>Resend message</resendText> or <cancelText>cancel message</cancelText> now.",
    "Connectivity to the server has been lost.": "Connectivity to the server has been lost.",
    "Sent messages will be stored until your connection has returned.": "Sent messages will be stored until your connection has returned.",
-    "Active call": "Active call",
    "There's no one else here! Would you like to <inviteText>invite others</inviteText> or <nowarnText>stop warning about the empty room</nowarnText>?": "There's no one else here! Would you like to <inviteText>invite others</inviteText> or <nowarnText>stop warning about the empty room</nowarnText>?",
    "You seem to be uploading files, are you sure you want to quit?": "You seem to be uploading files, are you sure you want to quit?",
    "You seem to be in a call, are you sure you want to quit?": "You seem to be in a call, are you sure you want to quit?",
@ -2130,7 +2136,6 @@
    "Switch theme": "Switch theme",
    "Security & privacy": "Security & privacy",
    "All settings": "All settings",
-    "Archived rooms": "Archived rooms",
    "Feedback": "Feedback",
    "User menu": "User menu",
    "Could not load user profile": "Could not load user profile",
--- a/src/settings/Settings.js
+++ b/src/settings/Settings.js
@ -159,12 +159,6 @@ export const SETTINGS = {
        supportedLevels: LEVELS_FEATURE,
        default: false,
    },
-    "feature_irc_ui": {
-        supportedLevels: LEVELS_ACCOUNT_SETTINGS,
-        displayName: _td('Enable IRC layout option in the appearance tab'),
-        default: false,
-        isFeature: true,
-    },
    "mjolnirRooms": {
        supportedLevels: ['account'],
        default: [],
@ -574,7 +568,7 @@ export const SETTINGS = {
    },
    "useIRCLayout": {
        supportedLevels: LEVELS_ACCOUNT_SETTINGS,
-        displayName: _td("Use IRC layout"),
+        displayName: _td("Enable experimental, compact IRC style layout"),
        default: false,
    },
 };
--- a/src/stores/BreadcrumbsStore.ts
+++ b/src/stores/BreadcrumbsStore.ts
@ -125,6 +125,7 @@ export class BreadcrumbsStore extends AsyncStoreWithClient<IState> {
    }

    private async appendRoom(room: Room) {
+        let updated = false;
        const rooms = (this.state.rooms || []).slice(); // cheap clone

        // If the room is upgraded, use that room instead. We'll also splice out
@ -136,25 +137,36 @@ export class BreadcrumbsStore extends AsyncStoreWithClient<IState> {
            // Take out any room that isn't the most recent room
            for (let i = 0; i < history.length - 1; i++) {
                const idx = rooms.findIndex(r => r.roomId === history[i].roomId);
-                if (idx !== -1) rooms.splice(idx, 1);
+                if (idx !== -1) {
+                    rooms.splice(idx, 1);
+                    updated = true;
+                }
            }
        }

        // Remove the existing room, if it is present
        const existingIdx = rooms.findIndex(r => r.roomId === room.roomId);
+
+        // If we're focusing on the first room no-op
+        if (existingIdx !== 0) {
            if (existingIdx !== -1) {
                rooms.splice(existingIdx, 1);
            }

            // Splice the room to the start of the list
            rooms.splice(0, 0, room);
+            updated = true;
+        }

        if (rooms.length > MAX_ROOMS) {
            // This looks weird, but it's saying to start at the MAX_ROOMS point in the
            // list and delete everything after it.
            rooms.splice(MAX_ROOMS, rooms.length - MAX_ROOMS);
+            updated = true;
        }

+
+        if (updated) {
            // Update the breadcrumbs
            await this.updateState({rooms});
            const roomIds = rooms.map(r => r.roomId);
@ -162,5 +174,6 @@ export class BreadcrumbsStore extends AsyncStoreWithClient<IState> {
                await SettingsStore.setValue("breadcrumb_rooms", null, SettingLevel.ACCOUNT, roomIds);
            }
        }
+    }

 }
--- a/src/stores/notifications/ListNotificationState.ts
+++ b/src/stores/notifications/ListNotificationState.ts
@ -14,23 +14,20 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import { EventEmitter } from "events";
-import { INotificationState, NOTIFICATION_STATE_UPDATE } from "./INotificationState";
 import { NotificationColor } from "./NotificationColor";
-import { IDestroyable } from "../../utils/IDestroyable";
 import { TagID } from "../room-list/models";
 import { Room } from "matrix-js-sdk/src/models/room";
 import { arrayDiff } from "../../utils/arrays";
 import { RoomNotificationState } from "./RoomNotificationState";
-import { TagSpecificNotificationState } from "./TagSpecificNotificationState";
+import { NOTIFICATION_STATE_UPDATE, NotificationState } from "./NotificationState";

-export class ListNotificationState extends EventEmitter implements IDestroyable, INotificationState {
-    private _count: number;
-    private _color: NotificationColor;
+export type FetchRoomFn = (room: Room) => RoomNotificationState;
+
+export class ListNotificationState extends NotificationState {
    private rooms: Room[] = [];
    private states: { [roomId: string]: RoomNotificationState } = {};

-    constructor(private byTileCount = false, private tagId: TagID) {
+    constructor(private byTileCount = false, private tagId: TagID, private getRoomFn: FetchRoomFn) {
        super();
    }

@ -38,14 +35,6 @@ export class ListNotificationState extends EventEmitter implements IDestroyable,
        return null; // This notification state doesn't support symbols
    }

-    public get count(): number {
-        return this._count;
-    }
-
-    public get color(): NotificationColor {
-        return this._color;
-    }
-
    public setRooms(rooms: Room[]) {
        // If we're only concerned about the tile count, don't bother setting up listeners.
        if (this.byTileCount) {
@ -62,10 +51,9 @@ export class ListNotificationState extends EventEmitter implements IDestroyable,
            if (!state) continue; // We likely just didn't have a badge (race condition)
            delete this.states[oldRoom.roomId];
            state.off(NOTIFICATION_STATE_UPDATE, this.onRoomNotificationStateUpdate);
-            state.destroy();
        }
        for (const newRoom of diff.added) {
-            const state = new TagSpecificNotificationState(newRoom, this.tagId);
+            const state = this.getRoomFn(newRoom);
            state.on(NOTIFICATION_STATE_UPDATE, this.onRoomNotificationStateUpdate);
            if (this.states[newRoom.roomId]) {
                // "Should never happen" disclaimer.
@ -85,8 +73,9 @@ export class ListNotificationState extends EventEmitter implements IDestroyable,
    }

    public destroy() {
+        super.destroy();
        for (const state of Object.values(this.states)) {
-            state.destroy();
+            state.off(NOTIFICATION_STATE_UPDATE, this.onRoomNotificationStateUpdate);
        }
        this.states = {};
    }
@ -96,7 +85,7 @@ export class ListNotificationState extends EventEmitter implements IDestroyable,
    };

    private calculateTotalState() {
-        const before = {count: this.count, symbol: this.symbol, color: this.color};
+        const snapshot = this.snapshot();

        if (this.byTileCount) {
            this._color = NotificationColor.Red;
@ -111,10 +100,7 @@ export class ListNotificationState extends EventEmitter implements IDestroyable,
        }

        // finally, publish an update if needed
-        const after = {count: this.count, symbol: this.symbol, color: this.color};
-        if (JSON.stringify(before) !== JSON.stringify(after)) {
-            this.emit(NOTIFICATION_STATE_UPDATE);
-        }
+        this.emitIfUpdated(snapshot);
    }
 }

--- a/src/stores/notifications/NotificationState.ts
+++ b/src/stores/notifications/NotificationState.ts
@ -0,0 +1,87 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { EventEmitter } from "events";
+import { NotificationColor } from "./NotificationColor";
+import { IDestroyable } from "../../utils/IDestroyable";
+
+export const NOTIFICATION_STATE_UPDATE = "update";
+
+export abstract class NotificationState extends EventEmitter implements IDestroyable {
+    protected _symbol: string;
+    protected _count: number;
+    protected _color: NotificationColor;
+
+    public get symbol(): string {
+        return this._symbol;
+    }
+
+    public get count(): number {
+        return this._count;
+    }
+
+    public get color(): NotificationColor {
+        return this._color;
+    }
+
+    public get isIdle(): boolean {
+        return this.color <= NotificationColor.None;
+    }
+
+    public get isUnread(): boolean {
+        return this.color >= NotificationColor.Bold;
+    }
+
+    public get hasUnreadCount(): boolean {
+        return this.color >= NotificationColor.Grey && (!!this.count || !!this.symbol);
+    }
+
+    public get hasMentions(): boolean {
+        return this.color >= NotificationColor.Red;
+    }
+
+    protected emitIfUpdated(snapshot: NotificationStateSnapshot) {
+        if (snapshot.isDifferentFrom(this)) {
+            this.emit(NOTIFICATION_STATE_UPDATE);
+        }
+    }
+
+    protected snapshot(): NotificationStateSnapshot {
+        return new NotificationStateSnapshot(this);
+    }
+
+    public destroy(): void {
+        this.removeAllListeners(NOTIFICATION_STATE_UPDATE);
+    }
+}
+
+export class NotificationStateSnapshot {
+    private readonly symbol: string;
+    private readonly count: number;
+    private readonly color: NotificationColor;
+
+    constructor(state: NotificationState) {
+        this.symbol = state.symbol;
+        this.count = state.count;
+        this.color = state.color;
+    }
+
+    public isDifferentFrom(other: NotificationState): boolean {
+        const before = {count: this.count, symbol: this.symbol, color: this.color};
+        const after = {count: other.count, symbol: other.symbol, color: other.color};
+        return JSON.stringify(before) !== JSON.stringify(after);
+    }
+}
--- a/src/stores/notifications/RoomNotificationState.ts
+++ b/src/stores/notifications/RoomNotificationState.ts
@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import { EventEmitter } from "events";
-import { INotificationState, NOTIFICATION_STATE_UPDATE } from "./INotificationState";
 import { NotificationColor } from "./NotificationColor";
 import { IDestroyable } from "../../utils/IDestroyable";
 import { MatrixClientPeg } from "../../MatrixClientPeg";
@ -25,12 +23,9 @@ import { MatrixEvent } from "matrix-js-sdk/src/models/event";
 import { Room } from "matrix-js-sdk/src/models/room";
 import * as RoomNotifs from '../../RoomNotifs';
 import * as Unread from '../../Unread';
+import { NotificationState } from "./NotificationState";

-export class RoomNotificationState extends EventEmitter implements IDestroyable, INotificationState {
-    private _symbol: string;
-    private _count: number;
-    private _color: NotificationColor;
-
+export class RoomNotificationState extends NotificationState implements IDestroyable {
    constructor(public readonly room: Room) {
        super();
        this.room.on("Room.receipt", this.handleReadReceipt);
@ -41,23 +36,12 @@ export class RoomNotificationState extends EventEmitter implements IDestroyable,
        this.updateNotificationState();
    }

-    public get symbol(): string {
-        return this._symbol;
-    }
-
-    public get count(): number {
-        return this._count;
-    }
-
-    public get color(): NotificationColor {
-        return this._color;
-    }
-
    private get roomIsInvite(): boolean {
        return getEffectiveMembership(this.room.getMyMembership()) === EffectiveMembership.Invite;
    }

    public destroy(): void {
+        super.destroy();
        this.room.removeListener("Room.receipt", this.handleReadReceipt);
        this.room.removeListener("Room.timeline", this.handleRoomEventUpdate);
        this.room.removeListener("Room.redaction", this.handleRoomEventUpdate);
@ -87,7 +71,7 @@ export class RoomNotificationState extends EventEmitter implements IDestroyable,
    };

    private updateNotificationState() {
-        const before = {count: this.count, symbol: this.symbol, color: this.color};
+        const snapshot = this.snapshot();

        if (RoomNotifs.getRoomNotifsState(this.room.roomId) === RoomNotifs.MUTE) {
            // When muted we suppress all notification states, even if we have context on them.
@ -136,9 +120,6 @@ export class RoomNotificationState extends EventEmitter implements IDestroyable,
        }

        // finally, publish an update if needed
-        const after = {count: this.count, symbol: this.symbol, color: this.color};
-        if (JSON.stringify(before) !== JSON.stringify(after)) {
-            this.emit(NOTIFICATION_STATE_UPDATE);
-        }
+        this.emitIfUpdated(snapshot);
    }
 }
--- a/src/stores/notifications/RoomNotificationStateStore.ts
+++ b/src/stores/notifications/RoomNotificationStateStore.ts
@ -0,0 +1,101 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { ActionPayload } from "../../dispatcher/payloads";
+import { AsyncStoreWithClient } from "../AsyncStoreWithClient";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import { DefaultTagID, TagID } from "../room-list/models";
+import { FetchRoomFn, ListNotificationState } from "./ListNotificationState";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { RoomNotificationState } from "./RoomNotificationState";
+import { TagSpecificNotificationState } from "./TagSpecificNotificationState";
+
+const INSPECIFIC_TAG = "INSPECIFIC_TAG";
+type INSPECIFIC_TAG = "INSPECIFIC_TAG";
+
+interface IState {}
+
+export class RoomNotificationStateStore extends AsyncStoreWithClient<IState> {
+    private static internalInstance = new RoomNotificationStateStore();
+
+    private roomMap = new Map<Room, Map<TagID | INSPECIFIC_TAG, RoomNotificationState>>();
+
+    private constructor() {
+        super(defaultDispatcher, {});
+    }
+
+    /**
+     * Creates a new list notification state. The consumer is expected to set the rooms
+     * on the notification state, and destroy the state when it no longer needs it.
+     * @param tagId The tag to create the notification state for.
+     * @returns The notification state for the tag.
+     */
+    public getListState(tagId: TagID): ListNotificationState {
+        // Note: we don't cache these notification states as the consumer is expected to call
+        // .setRooms() on the returned object, which could confuse other consumers.
+
+        // TODO: Update if/when invites move out of the room list.
+        const useTileCount = tagId === DefaultTagID.Invite;
+        const getRoomFn: FetchRoomFn = (room: Room) => {
+            return this.getRoomState(room, tagId);
+        };
+        return new ListNotificationState(useTileCount, tagId, getRoomFn);
+    }
+
+    /**
+     * Gets a copy of the notification state for a room. The consumer should not
+     * attempt to destroy the returned state as it may be shared with other
+     * consumers.
+     * @param room The room to get the notification state for.
+     * @param inTagId Optional tag ID to scope the notification state to.
+     * @returns The room's notification state.
+     */
+    public getRoomState(room: Room, inTagId?: TagID): RoomNotificationState {
+        if (!this.roomMap.has(room)) {
+            this.roomMap.set(room, new Map<TagID | INSPECIFIC_TAG, RoomNotificationState>());
+        }
+
+        const targetTag = inTagId ? inTagId : INSPECIFIC_TAG;
+
+        const forRoomMap = this.roomMap.get(room);
+        if (!forRoomMap.has(targetTag)) {
+            if (inTagId) {
+                forRoomMap.set(inTagId, new TagSpecificNotificationState(room, inTagId));
+            } else {
+                forRoomMap.set(INSPECIFIC_TAG, new RoomNotificationState(room));
+            }
+        }
+
+        return forRoomMap.get(targetTag);
+    }
+
+    public static get instance(): RoomNotificationStateStore {
+        return RoomNotificationStateStore.internalInstance;
+    }
+
+    protected async onNotReady(): Promise<any> {
+        for (const roomMap of this.roomMap.values()) {
+            for (const roomState of roomMap.values()) {
+                roomState.destroy();
+            }
+        }
+    }
+
+    // We don't need this, but our contract says we do.
+    protected async onAction(payload: ActionPayload) {
+        return Promise.resolve();
+    }
+}
--- a/src/stores/notifications/StaticNotificationState.ts
+++ b/src/stores/notifications/StaticNotificationState.ts
@ -14,13 +14,15 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

-import { EventEmitter } from "events";
-import { INotificationState } from "./INotificationState";
 import { NotificationColor } from "./NotificationColor";
+import { NotificationState } from "./NotificationState";

-export class StaticNotificationState extends EventEmitter implements INotificationState {
-    constructor(public symbol: string, public count: number, public color: NotificationColor) {
+export class StaticNotificationState extends NotificationState {
+    constructor(symbol: string, count: number, color: NotificationColor) {
        super();
+        this._symbol = symbol;
+        this._count = count;
+        this._color = color;
    }

    public static forCount(count: number, color: NotificationColor): StaticNotificationState {
--- a/src/stores/room-list/ListLayout.ts
+++ b/src/stores/room-list/ListLayout.ts
@ -92,11 +92,12 @@ export class ListLayout {
        return 5 + RESIZER_BOX_FACTOR;
    }

-    public setVisibleTilesWithin(diff: number, maxPossible: number) {
-        if (this.visibleTiles > maxPossible) {
-            this.visibleTiles = maxPossible + diff;
+    public setVisibleTilesWithin(newVal: number, maxPossible: number) {
+        maxPossible = maxPossible + RESIZER_BOX_FACTOR;
+        if (newVal > maxPossible) {
+            this.visibleTiles = maxPossible;
        } else {
-            this.visibleTiles += diff;
+            this.visibleTiles = newVal;
        }
    }

@ -111,10 +112,6 @@ export class ListLayout {
        return this.tilesToPixels(Math.min(maxTiles, n)) + padding;
    }

-    public tilesWithResizerBoxFactor(n: number): number {
-        return n + RESIZER_BOX_FACTOR;
-    }
-
    public tilesWithPadding(n: number, paddingPx: number): number {
        return this.pixelsToTiles(this.tilesToPixelsWithPadding(n, paddingPx));
    }
--- a/src/stores/room-list/RoomListLayoutStore.ts
+++ b/src/stores/room-list/RoomListLayoutStore.ts
@ -0,0 +1,73 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { TagID } from "./models";
+import { ListLayout } from "./ListLayout";
+import { AsyncStoreWithClient } from "../AsyncStoreWithClient";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import { ActionPayload } from "../../dispatcher/payloads";
+
+interface IState {}
+
+export default class RoomListLayoutStore extends AsyncStoreWithClient<IState> {
+    private static internalInstance: RoomListLayoutStore;
+
+    private readonly layoutMap = new Map<TagID, ListLayout>();
+
+    constructor() {
+        super(defaultDispatcher);
+    }
+
+    public static get instance(): RoomListLayoutStore {
+        if (!RoomListLayoutStore.internalInstance) {
+            RoomListLayoutStore.internalInstance = new RoomListLayoutStore();
+        }
+        return RoomListLayoutStore.internalInstance;
+    }
+
+    public ensureLayoutExists(tagId: TagID) {
+        if (!this.layoutMap.has(tagId)) {
+            this.layoutMap.set(tagId, new ListLayout(tagId));
+        }
+    }
+
+    public getLayoutFor(tagId: TagID): ListLayout {
+        if (!this.layoutMap.has(tagId)) {
+            this.layoutMap.set(tagId, new ListLayout(tagId));
+        }
+        return this.layoutMap.get(tagId);
+    }
+
+    // Note: this primarily exists for debugging, and isn't really intended to be used by anything.
+    public async resetLayouts() {
+        console.warn("Resetting layouts for room list");
+        for (const layout of this.layoutMap.values()) {
+            layout.reset();
+        }
+    }
+
+    protected async onNotReady(): Promise<any> {
+        // On logout, clear the map.
+        this.layoutMap.clear();
+    }
+
+    // We don't need this function, but our contract says we do
+    protected async onAction(payload: ActionPayload): Promise<any> {
+        return Promise.resolve();
+    }
+}
+
+window.mx_RoomListLayoutStore = RoomListLayoutStore.instance;
--- a/src/stores/room-list/RoomListStore2.ts
+++ b/src/stores/room-list/RoomListStore2.ts
@ -32,6 +32,7 @@ import { Algorithm, LIST_UPDATED_EVENT } from "./algorithms/Algorithm";
 import { EffectiveMembership, getEffectiveMembership } from "./membership";
 import { ListLayout } from "./ListLayout";
 import { isNullOrUndefined } from "matrix-js-sdk/src/utils";
+import RoomListLayoutStore from "./RoomListLayoutStore";

 interface IState {
    tagsEnabled?: boolean;
@ -50,6 +51,7 @@ export class RoomListStore2 extends AsyncStore<ActionPayload> {
    private algorithm = new Algorithm();
    private filterConditions: IFilterCondition[] = [];
    private tagWatcher = new TagWatcher(this);
+    private layoutMap: Map<TagID, ListLayout> = new Map<TagID, ListLayout>();

    private readonly watchedSettings = [
        'feature_custom_tags',
@ -416,6 +418,8 @@ export class RoomListStore2 extends AsyncStore<ActionPayload> {
        for (const tagId of OrderedDefaultTagIDs) {
            sorts[tagId] = this.calculateTagSorting(tagId);
            orders[tagId] = this.calculateListOrder(tagId);
+
+            RoomListLayoutStore.instance.ensureLayoutExists(tagId);
        }

        if (this.state.tagsEnabled) {
@ -434,15 +438,6 @@ export class RoomListStore2 extends AsyncStore<ActionPayload> {
        this.emit(LISTS_UPDATE_EVENT, this);
    }

-    // Note: this primarily exists for debugging, and isn't really intended to be used by anything.
-    public async resetLayouts() {
-        console.warn("Resetting layouts for room list");
-        for (const tagId of Object.keys(this.orderedLists)) {
-            new ListLayout(tagId).reset();
-        }
-        await this.regenerateAllLists();
-    }
-
    public addFilter(filter: IFilterCondition): void {
        // TODO: Remove debug: https://github.com/vector-im/riot-web/issues/14035
        console.log("Adding filter condition:", filter);
--- a/src/stores/room-list/algorithms/Algorithm.ts
+++ b/src/stores/room-list/algorithms/Algorithm.ts
@ -655,18 +655,35 @@ export class Algorithm extends EventEmitter {
                cause = RoomUpdateCause.PossibleTagChange;
            }

-            // If we have tags for a room and don't have the room referenced, the room reference
-            // probably changed. We need to swap out the problematic reference.
-            if (hasTags && !this.rooms.includes(room) && !isSticky) {
-                console.warn(`${room.roomId} is missing from room array but is known - trying to find duplicate`);
+            // Check to see if the room is known first
+            let knownRoomRef = this.rooms.includes(room);
+            if (hasTags && !knownRoomRef) {
+                console.warn(`${room.roomId} might be a reference change - attempting to update reference`);
                this.rooms = this.rooms.map(r => r.roomId === room.roomId ? room : r);
-
-                // Sanity check
-                if (!this.rooms.includes(room)) {
-                    throw new Error(`Failed to replace ${room.roomId} with an updated reference`);
+                knownRoomRef = this.rooms.includes(room);
+                if (!knownRoomRef) {
+                    console.warn(`${room.roomId} is still not referenced. It may be sticky.`);
                }
            }

+            if (hasTags && isForLastSticky && !knownRoomRef) {
+                // we have a fairly good chance at losing a room right now. Under some circumstances,
+                // we can end up with a room which transitions references and tag changes, then gets
+                // lost when the sticky room changes. To counter this, we try and add the room to the
+                // list manually as the condition below to update the reference will fail.
+                //
+                // Other conditions *should* result in the room being sorted into the right place.
+                console.warn(`${room.roomId} was about to be lost - inserting at end of room list`);
+                this.rooms.push(room);
+                knownRoomRef = true;
+            }
+
+            // If we have tags for a room and don't have the room referenced, something went horribly
+            // wrong - the reference should have been updated above.
+            if (hasTags && !knownRoomRef && !isSticky) {
+                throw new Error(`${room.roomId} is missing from room array but is known - trying to find duplicate`);
+            }
+
            // Like above, update the reference to the sticky room if we need to
            if (hasTags && isSticky) {
                // Go directly in and set the sticky room's new reference, being careful not
--- a/src/stores/room-list/previews/MessageEventPreview.ts
+++ b/src/stores/room-list/previews/MessageEventPreview.ts
@ -20,6 +20,7 @@ import { MatrixEvent } from "matrix-js-sdk/src/models/event";
 import { _t } from "../../../languageHandler";
 import { getSenderName, isSelf, shouldPrefixMessagesIn } from "./utils";
 import ReplyThread from "../../../components/views/elements/ReplyThread";
+import { sanitizedHtmlNodeInnerText } from "../../../HtmlUtils";

 export class MessageEventPreview implements IPreview {
    public getTextFor(event: MatrixEvent, tagId?: TagID): string {
@ -36,14 +37,27 @@ export class MessageEventPreview implements IPreview {
        const msgtype = eventContent['msgtype'];
        if (!body || !msgtype) return null; // invalid event, no preview

+        const hasHtml = eventContent.format === "org.matrix.custom.html" && eventContent.formatted_body;
+        if (hasHtml) {
+            body = eventContent.formatted_body;
+        }
+
        // XXX: Newer relations have a getRelation() function which is not compatible with replies.
        const mRelatesTo = event.getWireContent()['m.relates_to'];
        if (mRelatesTo && mRelatesTo['m.in_reply_to']) {
            // If this is a reply, get the real reply and use that
+            if (hasHtml) {
+                body = (ReplyThread.stripHTMLReply(body) || '').trim();
+            } else {
                body = (ReplyThread.stripPlainReply(body) || '').trim();
+            }
            if (!body) return null; // invalid event, no preview
        }

+        if (hasHtml) {
+            body = sanitizedHtmlNodeInnerText(body);
+        }
+
        if (msgtype === 'm.emote') {
            return _t("%(senderName)s %(emote)s", {senderName: getSenderName(event), emote: body});
        }
--- a/test/components/views/messages/TextualBody-test.js
+++ b/test/components/views/messages/TextualBody-test.js
@ -205,8 +205,9 @@ describe("<TextualBody />", () => {
            expect(content.html()).toBe('<span class="mx_EventTile_body markdown-body" dir="auto">' +
                'Hey <span>' +
                '<a class="mx_Pill mx_UserPill" title="@user:server">' +
-                '<img class="mx_BaseAvatar mx_BaseAvatar_image" src="mxc://avatar.url/image.png" ' +
-                'style="width: 16px; height: 16px;" title="@member:domain.bla" alt="" aria-hidden="true">Member</a>' +
+                '<img src="mxc://avatar.url/image.png" style="width: 16px; height: 16px;" ' +
+                'title="@member:domain.bla" alt="" aria-hidden="true" role="button" tabindex="0" ' +
+                'class="mx_AccessibleButton mx_BaseAvatar mx_BaseAvatar_image">Member</a>' +
                '</span></span>');
        });
    });
--- a/yarn.lock
+++ b/yarn.lock
@ -1308,6 +1308,13 @@
  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.4.tgz#38fd73ddfd9b55abb1e1b2ed578cb55bd7b7d339"
  integrity sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==

+"@types/linkifyjs@^2.1.3":
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/@types/linkifyjs/-/linkifyjs-2.1.3.tgz#80195c3c88c5e75d9f660e3046ce4a42be2c2fa4"
+  integrity sha512-V3Xt9wgaOvDPXcpOy3dC8qXCxy3cs0Lr/Hqgd9Bi6m3sf/vpbpTtfmVR0LJklrqYEjaAmc7e3Xh/INT2rCAKjQ==
+  dependencies:
+    "@types/react" "*"
+
 "@types/lodash@^4.14.152":
  version "4.14.155"
  resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.155.tgz#e2b4514f46a261fd11542e47519c20ebce7bc23a"
@ -1372,6 +1379,13 @@
    "@types/prop-types" "*"
    csstype "^2.2.0"

+"@types/sanitize-html@^1.23.3":
+  version "1.23.3"
+  resolved "https://registry.yarnpkg.com/@types/sanitize-html/-/sanitize-html-1.23.3.tgz#26527783aba3bf195ad8a3c3e51bd3713526fc0d"
+  integrity sha512-Isg8N0ifKdDq6/kaNlIcWfapDXxxquMSk2XC5THsOICRyOIhQGds95XH75/PL/g9mExi4bL8otIqJM/Wo96WxA==
+  dependencies:
+    htmlparser2 "^4.1.0"
+
 "@types/stack-utils@^1.0.1":
  version "1.0.1"
  resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"
@ -2499,7 +2513,7 @@ class-utils@^0.3.5:
    isobject "^3.0.0"
    static-extend "^0.1.1"

-classnames@^2.1.2, classnames@^2.2.5:
+classnames@^2.1.2:
  version "2.2.6"
  resolved "https://registry.yarnpkg.com/classnames/-/classnames-2.2.6.tgz#43935bffdd291f326dad0a205309b38d00f650ce"
  integrity sha512-JR/iSQOSt+LQIWwrwEzJ9uk0xfN3mTVYMwt1Ir5mUcSN6pU+V4zQFFaJsclJbPuAUQH+yfWef6tm7l1quW3C8Q==
@ -3779,6 +3793,11 @@ fast-levenshtein@~2.0.6:
  resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
  integrity sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=

+fast-memoize@^2.5.1:
+  version "2.5.2"
+  resolved "https://registry.yarnpkg.com/fast-memoize/-/fast-memoize-2.5.2.tgz#79e3bb6a4ec867ea40ba0e7146816f6cdce9b57e"
+  integrity sha512-Ue0LwpDYErFbmNnZSF0UH6eImUwDmogUO1jyE+JbN2gsQz/jICm1Ve7t9QT0rNSsfJt+Hs4/S3GnsDVjL4HVrw==
+
 fb-watchman@^2.0.0:
  version "2.0.1"
  resolved "https://registry.yarnpkg.com/fb-watchman/-/fb-watchman-2.0.1.tgz#fc84fb39d2709cf3ff6d743706157bb5708a8a85"
@ -6882,7 +6901,7 @@ prop-types-exact@^1.2.0:
    object.assign "^4.1.0"
    reflect.ownkeys "^0.2.0"

-prop-types@15.x, prop-types@^15.5.8, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2:
+prop-types@^15.5.8, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2:
  version "15.7.2"
  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
  integrity sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==
@ -7053,6 +7072,13 @@ rc@1.2.8, rc@^1.2.8:
    minimist "^1.2.0"
    strip-json-comments "~2.0.1"

+re-resizable@^6.5.2:
+  version "6.5.2"
+  resolved "https://registry.yarnpkg.com/re-resizable/-/re-resizable-6.5.2.tgz#7eb1928c673285d4dcf654211e47acb9a3801c3e"
+  integrity sha512-Pjo3ydkr/meTr6j3YZqyv+9fRS5UNOj5SaAI06gHFQ35BnpsZKmwNvupCnbo11gjQ1I62Uy+UzlHLO9xPQEuWQ==
+  dependencies:
+    fast-memoize "^2.5.1"
+
 react-beautiful-dnd@^4.0.1:
  version "4.0.1"
  resolved "https://registry.yarnpkg.com/react-beautiful-dnd/-/react-beautiful-dnd-4.0.1.tgz#3b0a49bf6be75af351176c904f012611dd292b81"
@ -7086,14 +7112,6 @@ react-dom@^16.9.0:
    prop-types "^15.6.2"
    scheduler "^0.19.1"

-react-draggable@^4.0.3:
-  version "4.4.2"
-  resolved "https://registry.yarnpkg.com/react-draggable/-/react-draggable-4.4.2.tgz#f3cefecee25f467f865144cda0d066e5f05f94a0"
-  integrity sha512-zLQs4R4bnBCGnCVTZiD8hPsHtkiJxgMpGDlRESM+EHQo8ysXhKJ2GKdJ8UxxLJdRVceX1j19jy+hQS2wHislPQ==
-  dependencies:
-    classnames "^2.2.5"
-    prop-types "^15.6.0"
-
 react-focus-lock@^2.2.1:
  version "2.3.1"
  resolved "https://registry.yarnpkg.com/react-focus-lock/-/react-focus-lock-2.3.1.tgz#9d5d85899773609c7eefa4fc54fff6a0f5f2fc47"
@ -7138,14 +7156,6 @@ react-redux@^5.0.6:
    react-is "^16.6.0"
    react-lifecycles-compat "^3.0.0"

-react-resizable@^1.10.1:
-  version "1.10.1"
-  resolved "https://registry.yarnpkg.com/react-resizable/-/react-resizable-1.10.1.tgz#f0c2cf1d83b3470b87676ce6d6b02bbe3f4d8cd4"
-  integrity sha512-Jd/bKOKx6+19NwC4/aMLRu/J9/krfxlDnElP41Oc+oLiUWs/zwV1S9yBfBZRnqAwQb6vQ/HRSk3bsSWGSgVbpw==
-  dependencies:
-    prop-types "15.x"
-    react-draggable "^4.0.3"
-
 react-test-renderer@^16.0.0-0, react-test-renderer@^16.9.0:
  version "16.13.1"
  resolved "https://registry.yarnpkg.com/react-test-renderer/-/react-test-renderer-16.13.1.tgz#de25ea358d9012606de51e012d9742e7f0deabc1"