Disables switching to dominant speaker when Etherpad is shown on large video.

modules/UI/etherpad/Etherpad.js

             });
         });
     }
+
+    /**
+     * @return {boolean} do not switch on dominant speaker event if on stage.
+     */
+    stayOnStage () {
+        return true;
+    }
 }
 
 /**

modules/UI/videolayout/LargeContainer.js

     showAvatar (show) {
     }
 
+    /**
+     * Whether current container needs to be switched on dominant speaker event
+     * when the container is on stage.
+     * @return {boolean}
+     */
+    stayOnStage () {
+    }
 }

modules/UI/videolayout/LargeVideo.js

             });
         });
     }
+
+    /**
+     * @return {boolean} switch on dominant speaker event if on stage.
+     */
+    stayOnStage () {
+        return false;
+    }
 }
 
 /**

modules/UI/videolayout/VideoLayout.js

         // since we don't want to switch to local video.
         // Update the large video if the video source is already available,
         // otherwise wait for the "videoactive.jingle" event.
-        if (!focusedVideoResourceJid && remoteVideo.hasVideoStarted()) {
+        if (!focusedVideoResourceJid
+            && remoteVideo.hasVideoStarted()
+            && !this.getCurrentlyOnLargeContainer().stayOnStage()) {
             this.updateLargeVideo(id);
         }
     },
         return this.isLargeContainerTypeVisible(VideoContainerType);
     },
 
+    /**
+     * @return {LargeContainer} the currently displayed container on large
+     * video.
+     */
+    getCurrentlyOnLargeContainer () {
+        return largeVideo.getContainer(largeVideo.state);
+    },
+
     isCurrentlyOnLarge (id) {
         return largeVideo && largeVideo.id === id;
     },