re-send tracks permissions after reconnected. (#128)

lib/src/core/room.dart

@@ -218,6 +218,8 @@ class Room extends DisposableChangeNotifier with EventsEmittable<RoomEvent> {
   void _setUpEngineListeners() => _engineListener
     ..on<EngineConnectionStateUpdatedEvent>((event) async {
       if (event.didReconnect) {
+        // re-send tracks permissions
+        localParticipant?.sendTrackSubscriptionPermissions();
         events.emit(const RoomReconnectedEvent());
         await _handlePostReconnect(false);
       } else if (event.newState == ConnectionState.reconnecting) {

lib/src/participant/local.dart

@@ -322,6 +322,9 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
     return null;
   }
 
+  bool _allParticipantsAllowed = true;
+  List<ParticipantTrackPermission> _participantTrackPermissions = [];
+
   /// Control who can subscribe to LocalParticipant's published tracks.
   ///
   /// By default, all participants can subscribe. This allows fine-grained control over
@@ -342,11 +345,22 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
   void setTrackSubscriptionPermissions({
     required bool allParticipantsAllowed,
     List<ParticipantTrackPermission> trackPermissions = const [],
-  }) =>
+  }) {
-      room.engine.signalClient.sendUpdateSubscriptionPermissions(
+    _allParticipantsAllowed = allParticipantsAllowed;
-        allParticipants: allParticipantsAllowed,
+    _participantTrackPermissions = trackPermissions;
-        trackPermissions: trackPermissions.map((e) => e.toPBType()).toList(),
+    sendTrackSubscriptionPermissions();
-      );
+  }
+
+  void sendTrackSubscriptionPermissions() {
+    if (room.engine.connectionState != ConnectionState.connected) {
+      return;
+    }
+    room.engine.signalClient.sendUpdateSubscriptionPermissions(
+      allParticipants: _allParticipantsAllowed,
+      trackPermissions:
+          _participantTrackPermissions.map((e) => e.toPBType()).toList(),
+    );
+  }
 
   @internal
   Iterable<lk_rtc.TrackPublishedResponse> publishedTracksInfo() =>