fix(breakout-rooms) ensure we use the same media types when joining

Only audio and video are considered. Screen sharing won't be preserved.

conference.js

@@ -1333,18 +1333,19 @@ export default {
     /**
      * Used by the Breakout Rooms feature to join a breakout room or go back to the main room.
      */
-    async joinRoom(roomName) {
+    async joinRoom(roomName, options) {
         // Reset VideoLayout. It's destroyed in features/video-layout/middleware.web.js so re-initialize it.
         VideoLayout.initLargeVideo();
         VideoLayout.resizeVideoArea();
 
-        // Destroy old tracks.
-        APP.store.dispatch(destroyLocalTracks());
+        // Restore initial state.
         this._localTracksInitialized = false;
+        this.isSharingScreen = false;
+        this.localPresenterVideo = null;
 
         this.roomName = roomName;
 
-        const { tryCreateLocalTracks, errors } = this.createInitialLocalTracks();
+        const { tryCreateLocalTracks, errors } = this.createInitialLocalTracks(options);
         const localTracks = await tryCreateLocalTracks;
 
         this._displayErrorsForCreateInitialLocalTracks(errors);

react/features/breakout-rooms/actions.js

@@ -11,9 +11,18 @@ import {
     createConference,
     getCurrentConference
 } from '../base/conference';
-import { setAudioMuted, setVideoMuted } from '../base/media';
+import {
+    MEDIA_TYPE,
+    setAudioMuted,
+    setVideoMuted
+} from '../base/media';
 import { getRemoteParticipants } from '../base/participants';
 import { createDesiredLocalTracks } from '../base/tracks/actions';
+import {
+    getLocalTracks,
+    isLocalCameraTrackMuted,
+    isLocalTrackMuted
+} from '../base/tracks';
 import {
     NOTIFICATION_TIMEOUT_TYPE,
     clearNotifications,
@@ -219,6 +228,10 @@ export function moveToRoom(roomId?: string) {
             dispatch(setVideoMuted(video.muted));
             dispatch(createDesiredLocalTracks());
         } else {
+            const localTracks = getLocalTracks(getState()['features/base/tracks']);
+            const isAudioMuted = isLocalTrackMuted(localTracks, MEDIA_TYPE.AUDIO);
+            const isVideoMuted = isLocalCameraTrackMuted(localTracks);
+
             try {
                 await APP.conference.leaveRoom(false /* doDisconnect */);
             } catch (error) {
@@ -227,7 +240,10 @@ export function moveToRoom(roomId?: string) {
                 // TODO: revisit why we don't dispatch CONFERENCE_LEFT here.
             }
 
-            APP.conference.joinRoom(_roomId);
+            APP.conference.joinRoom(_roomId, {
+                startWithAudioMuted: isAudioMuted,
+                startWithVideoMuted: isVideoMuted
+            });
         }
 
         if (goToMainRoom) {