Wire space switch shortcut via dispatcher to prevent app load explosion due to skinning

src/dispatcher/actions.ts

@@ -138,4 +138,9 @@ export enum Action {
      * Fired when an upload is cancelled by the user. Should be used with UploadCanceledPayload.
      */
     UploadCanceled = "upload_canceled",
+
+    /**
+     * Switches space. Should be used with SwitchSpacePayload.
+     */
+    SwitchSpace = "switch_space",
 }

src/dispatcher/payloads/SwitchSpacePayload.ts

@@ -0,0 +1,27 @@
+/*
+Copyright 2021 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 "../payloads";
+import { Action } from "../actions";
+
+export interface SwitchSpacePayload extends ActionPayload {
+    action: Action.SwitchSpace;
+
+    /**
+     * The number of the space to switch to, 1-indexed, 0 is Home.
+     */
+    num: number;
+}

src/stores/SpaceStore.tsx

@@ -33,6 +33,7 @@ import {EnhancedMap, mapDiff} from "../utils/maps";
 import {setHasDiff} from "../utils/sets";
 import {ISpaceSummaryEvent, ISpaceSummaryRoom} from "../components/structures/SpaceRoomDirectory";
 import RoomViewStore from "./RoomViewStore";
+import {Action} from "../dispatcher/actions";
 
 interface IState {}
 
@@ -565,6 +566,12 @@ export class SpaceStoreClass extends AsyncStoreWithClient<IState> {
                     this.setActiveSpace(null, false);
                 }
                 break;
+            case Action.SwitchSpace:
+                if (payload.num === 0) {
+                    this.setActiveSpace(null);
+                } else if (this.spacePanelSpaces.length >= payload.num) {
+                    this.setActiveSpace(this.spacePanelSpaces[payload.num - 1]);
+                }
         }
     }