fix(etherpad) fix Etherpad closing when dominant speaker changes

Fixes: https://github.com/jitsi/jitsi-meet/issues/8109

react/features/large-video/actions.any.js

@@ -28,6 +28,12 @@ import {
 export function selectParticipantInLargeVideo(participant: ?string) {
     return (dispatch: Dispatch<any>, getState: Function) => {
         const state = getState();
+
+        // Keep Etherpad open.
+        if (state['features/etherpad'].editing) {
+            return;
+        }
+
         const participantId = participant ?? _electParticipantInLargeVideo(state);
         const largeVideo = state['features/large-video'];
         const remoteScreenShares = state['features/video-layout'].remoteScreenShares;

react/features/large-video/middleware.js

@@ -13,6 +13,7 @@ import {
     TRACK_ADDED,
     TRACK_REMOVED
 } from '../base/tracks';
+import { TOGGLE_DOCUMENT_EDITING } from '../etherpad/actionTypes';
 
 import { selectParticipantInLargeVideo } from './actions';
 import logger from './logger';
@@ -47,6 +48,7 @@ MiddlewareRegistry.register(store => next => action => {
     case PARTICIPANT_JOINED:
     case PARTICIPANT_LEFT:
     case PIN_PARTICIPANT:
+    case TOGGLE_DOCUMENT_EDITING:
     case TRACK_ADDED:
     case TRACK_REMOVED:
         store.dispatch(selectParticipantInLargeVideo());