correctly detected collapsed rhs

src/components/structures/MainSplit.js

@@ -55,7 +55,7 @@ export default class MainSplit extends React.Component {
     }
 
     componentDidMount() {
-        if (this.props.panel && !this.collapsedRhs) {
+        if (this.props.panel && !this.props.collapsedRhs) {
             this._createResizer();
         }
     }

src/components/structures/RoomGridView.js

@@ -0,0 +1,92 @@
+/*
+Copyright 2017 Vector Creations Ltd.
+Copyright 2017, 2018 New Vector Ltd.
+
+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 PropTypes from 'prop-types';
+
+export default class RoomGridView extends React.Component {
+    /* displayName: 'GroupView',
+
+    propTypes: {
+        groupId: PropTypes.string.isRequired,
+    },
+
+    childContextTypes = {
+        groupStore: PropTypes.instanceOf(GroupStore),
+    };*/
+
+    getInitialState() {
+        return {
+            rooms: [],
+        };
+    }
+
+    componentWillMount() {
+        this._unmounted = false;
+        this._initGroupStore(this.props.groupId);
+        this._dispatcherRef = dis.register(this._onAction);
+    }
+
+    componentWillUnmount() {
+        this._unmounted = true;
+        if (this._groupStoreRegistration) {
+            this._groupStoreRegistration.unregister();
+        }
+        dis.unregister(this._dispatcherRef);
+    }
+
+    componentWillReceiveProps(newProps) {
+        if (this.props.groupId != newProps.groupId) {
+            this.setState(this.getInitialState(), () => {
+                this._initGroupStore(newProps.groupId);
+            });
+        }
+    }
+
+    _initGroupStore(groupId) {
+        if (this._groupStoreRegistration) {
+            this._groupStoreRegistration.unregister();
+        }
+        this._groupStoreRegistration = GroupStore.registerListener(groupId, this.onGroupStoreUpdated);
+    }
+
+    onGroupStoreUpdated() {
+        if (this._unmounted) return;
+        this.setState({
+            rooms: GroupStore.getGroupRooms(this.props.groupId),
+        });
+    }
+
+    _onAction(payload) {
+        switch (payload.action) {
+            default:
+                break;
+        }
+    }
+
+    render() {
+        const rooms = this.state.rooms.slice(0, 6);
+        return <main class="mx_RoomGridView">
+            { rooms.map(room => {
+                <section class="mx_RoomGridView_tile">
+                    <RoomView roomId={room.roomId} />
+                </section>
+            }) }
+        </main>
+    }
+
+}