Fixes issue with switching to the screen stream before conference starts(when we're still alone in the room).

index.html

     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=97"></script>
+    <script src="libs/app.bundle.js?v=98"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=7"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

libs/app.bundle.js

         this.localVideo = this.createLocalStream(videoStream, "video", true, type);
         // Stop the stream to trigger onended event for old stream
         oldStream.stop();
+
+        this.switchVideoStreams(videoStream, oldStream);
+
         APP.xmpp.switchStreams(videoStream, oldStream,localCallback);
     },
     changeLocalAudio: function (stream, callback) {
 
         localVideoThumbnail.changeVideo(stream, isMuted);
 
-        LargeVideo.updateLargeVideo(APP.xmpp.myResource());
+        LargeVideo.updateLargeVideo(
+            APP.xmpp.myResource(),
+            /* force update only before conference starts */
+            !APP.xmpp.isConferenceInProgress());
 
     };
 
             self.peerconnection.addStream(new_stream);
     }
 
-    if(!isAudio)
-    APP.RTC.switchVideoStreams(new_stream, oldStream);
-
     // Conference is not active
     if(!oldSdp || !self.peerconnection) {
         success_callback();
     isExternalAuthEnabled: function () {
         return Moderator.isExternalAuthEnabled();
     },
+    isConferenceInProgress: function () {
+        return connection && connection.jingle.activecall &&
+            connection.jingle.activecall.peerconnection;
+    },
     switchStreams: function (stream, oldStream, callback, isAudio) {
-        if (connection && connection.jingle.activecall) {
+        if (this.isConferenceInProgress()) {
             // FIXME: will block switchInProgress on true value in case of exception
             connection.jingle.activecall.switchStreams(stream, oldStream, callback, isAudio);
         } else {
         return connection.jingle.sessions;
     },
     removeStream: function (stream) {
-        if(!connection || !connection.jingle.activecall ||
-            !connection.jingle.activecall.peerconnection)
+        if (!this.isConferenceInProgress())
             return;
         connection.jingle.activecall.peerconnection.removeStream(stream);
     }

modules/RTC/RTC.js

         this.localVideo = this.createLocalStream(videoStream, "video", true, type);
         // Stop the stream to trigger onended event for old stream
         oldStream.stop();
+
+        this.switchVideoStreams(videoStream, oldStream);
+
         APP.xmpp.switchStreams(videoStream, oldStream,localCallback);
     },
     changeLocalAudio: function (stream, callback) {

modules/UI/videolayout/VideoLayout.js

 
         localVideoThumbnail.changeVideo(stream, isMuted);
 
-        LargeVideo.updateLargeVideo(APP.xmpp.myResource());
+        LargeVideo.updateLargeVideo(
+            APP.xmpp.myResource(),
+            /* force update only before conference starts */
+            !APP.xmpp.isConferenceInProgress());
 
     };
 

modules/xmpp/JingleSession.js

             self.peerconnection.addStream(new_stream);
     }
 
-    if(!isAudio)
-    APP.RTC.switchVideoStreams(new_stream, oldStream);
-
     // Conference is not active
     if(!oldSdp || !self.peerconnection) {
         success_callback();

modules/xmpp/xmpp.js

     isExternalAuthEnabled: function () {
         return Moderator.isExternalAuthEnabled();
     },
+    isConferenceInProgress: function () {
+        return connection && connection.jingle.activecall &&
+            connection.jingle.activecall.peerconnection;
+    },
     switchStreams: function (stream, oldStream, callback, isAudio) {
-        if (connection && connection.jingle.activecall) {
+        if (this.isConferenceInProgress()) {
             // FIXME: will block switchInProgress on true value in case of exception
             connection.jingle.activecall.switchStreams(stream, oldStream, callback, isAudio);
         } else {
         return connection.jingle.sessions;
     },
     removeStream: function (stream) {
-        if(!connection || !connection.jingle.activecall ||
-            !connection.jingle.activecall.peerconnection)
+        if (!this.isConferenceInProgress())
             return;
         connection.jingle.activecall.peerconnection.removeStream(stream);
     }