fix: fixed screensharing persistence and track issue (#681)

* fixed screensharing persistence and track issue

* changes keys for rebuilds

Author: d3xvn

packages/stream_video_flutter/lib/src/call_participants/call_participants.dart

@@ -132,18 +132,8 @@ class _StreamCallParticipantsState extends State<StreamCallParticipants> {
         final screenShareTrack = it.screenShareTrack;
         final isScreenShareEnabled = it.isScreenShareEnabled;
 
-        // If the screen share track is local, we don't have to subscribe to
-        // anything and we can directly use the mute state.
-        if (screenShareTrack is! RemoteTrackState) return isScreenShareEnabled;
-
-        // If the screen share track is remote and already subscribed and
-        // received, we can directly use the mute state.
-        if (screenShareTrack.subscribed && screenShareTrack.received) {
-          return isScreenShareEnabled;
-        }
-
-        // If it's not yet subscribed, we have to show it in order for it to
-        // start the subscription process.
+        if (screenShareTrack == null || !isScreenShareEnabled) return false;
+
         return true;
       },
     );

packages/stream_video_flutter/lib/src/call_participants/regular_call_participants_content.dart

@@ -43,9 +43,7 @@ class RegularCallParticipantsContent extends StatelessWidget {
     CallParticipantState participant,
   ) {
     return StreamCallParticipant(
-      // We use the sessionId as the key to avoid rebuilding the widget
-      // when the participant changes.
-      key: ValueKey(participant.sessionId),
+      key: ValueKey(participant.userId),
       call: call,
       participant: participant,
     );

packages/stream_video_flutter/lib/src/call_participants/screen_share_call_participants_content.dart

@@ -38,9 +38,7 @@ class ScreenShareCallParticipantsContent extends StatelessWidget {
     CallParticipantState participant,
   ) {
     return StreamCallParticipant(
-      // We use the sessionId as the key to avoid rebuilding the widget
-      // when the participant changes.
-      key: ValueKey(participant.sessionId),
+      key: ValueKey(participant.userId),
       call: call,
       participant: participant,
     );
@@ -67,7 +65,7 @@ class ScreenShareCallParticipantsContent extends StatelessWidget {
         return Stack(
           children: [
             ScreenShareContent(
-              key: ValueKey('${participant.sessionId} - screenShareContent'),
+              key: ValueKey('${participant.userId} - screenShareContent'),
               call: call,
               participant: participant,
             ),

packages/stream_video_flutter/lib/src/renderer/video_renderer.dart

@@ -58,7 +58,7 @@ class StreamVideoRenderer extends StatelessWidget {
     }
 
     return VisibilityDetector(
-      key: Key('${participant.sessionId}${trackState?.muted}'),
+      key: Key('${participant.userId}${participant.sessionId}$videoTrackType${trackState?.muted}'),
       onVisibilityChanged: _onVisibilityChanged,
       child: child,
     );