Fixes returning to dominant speaker after closing shared video. Renames a method and fix its behaviour was handling both case when removing just video element in small videos (local or remote) and when we are removingParticipantContainer, now just handles the second one and uses focusedID if any or dominantSpeakerID if any, otherwise elects new video.

modules/UI/shared_video/SharedVideo.js

 
     // Make sure that the large video is updated if are removing its
     // corresponding small video.
-    this.VideoLayout.updateRemovedVideo(this.id);
+    this.VideoLayout.updateAfterThumbRemoved(this.id);
 
     // Remove whole container
     if (this.container.parentNode) {

modules/UI/videolayout/LocalVideo.js

 
     let endedHandler = () => {
         localVideoContainer.removeChild(localVideo);
-        this.VideoLayout.updateRemovedVideo(this.id);
+        // when removing only the video element and we are on stage
+        // update the stage
+        if(this.VideoLayout.isCurrentlyOnLarge(this.id))
+            this.VideoLayout.updateLargeVideo(this.id);
         stream.off(TrackEvents.LOCAL_TRACK_STOPPED, endedHandler);
     };
     stream.on(TrackEvents.LOCAL_TRACK_STOPPED, endedHandler);

modules/UI/videolayout/RemoteVideo.js

     console.info((isVideo ? "Video" : "Audio") +
                  " removed " + this.id, select);
 
-    if (isVideo)
-        this.VideoLayout.updateRemovedVideo(this.id);
+    // when removing only the video element and we are on stage
+    // update the stage
+    if (isVideo && this.VideoLayout.isCurrentlyOnLarge(this.id))
+        this.VideoLayout.updateLargeVideo(this.id);
 };
 
 /**
     this.removeConnectionIndicator();
     // Make sure that the large video is updated if are removing its
     // corresponding small video.
-    this.VideoLayout.updateRemovedVideo(this.id);
+    this.VideoLayout.updateAfterThumbRemoved(this.id);
     // Remove whole container
     if (this.container.parentNode) {
         this.container.parentNode.removeChild(this.container);

modules/UI/videolayout/VideoLayout.js

     /**
      * Checks if removed video is currently displayed and tries to display
      * another one instead.
+     * Uses focusedID if any or dominantSpeakerID if any,
+     * otherwise elects new video, in this order.
      */
-    updateRemovedVideo (id) {
+    updateAfterThumbRemoved (id) {
         if (!this.isCurrentlyOnLarge(id)) {
             return;
         }
 
         let newId;
 
-        // We'll show user's avatar if he is the dominant speaker or if
-        // his video thumbnail is pinned
-        if (remoteVideos[id] && (id === pinnedId
-                                || id === currentDominantSpeaker)) {
-            newId = id;
-        } else {
-            // Otherwise select last visible video
+        if (pinnedId)
+            newId = pinnedId;
+        else if (currentDominantSpeaker)
+            newId = currentDominantSpeaker;
+        else // Otherwise select last visible video
             newId = this.electLastVisibleVideo();
         }
 
      */
     handleVideoThumbClicked (id) {
         if(pinnedId) {
-            var oldSmallVideo
-                    = VideoLayout.getSmallVideo(pinnedId);
+            var oldSmallVideo = VideoLayout.getSmallVideo(pinnedId);
             if (oldSmallVideo && !interfaceConfig.filmStripOnly)
                 oldSmallVideo.focus(false);
         }