chore: Properly close usermedia/screen stream for 1v1/group calls.

lib/src/voip/call.dart

@@ -84,10 +84,10 @@ class WrappedMediaStream {
     renderer.srcObject = null;
     if (isLocal()) {
       if (isWeb) {
-        await stream?.dispose();
+        await stopMediaStream(stream);
       } else {
         if (!isGroupCall) {
-          await stream?.dispose();
+          await stopMediaStream(stream);
         }
       }
     }

lib/src/voip/group_call.dart

@@ -614,7 +614,7 @@ class GroupCall {
       calls.forEach((call) {
         call.removeLocalStream(call.localScreenSharingStream!);
       });
-      stopMediaStream(localScreenshareStream!.stream);
+      await stopMediaStream(localScreenshareStream?.stream);
       removeScreenshareStream(localScreenshareStream!);
       localScreenshareStream = null;
       localDesktopCapturerSourceId = null;
@@ -1094,8 +1094,8 @@ class GroupCall {
     onStreamRemoved.add(stream);
 
     if (stream.isLocal()) {
-      stream?.disposeRenderer();
-      stream?.stream?.dispose();
+      stream.disposeRenderer();
+      stopMediaStream(stream.stream);
     }
 
     onGroupCallEvent.add(GroupCallEvent.UserMediaStreamsChanged);
@@ -1186,7 +1186,10 @@ class GroupCall {
 
     onStreamRemoved.add(stream);
 
-    stream.dispose();
+    if (stream.isLocal()) {
+      stream.disposeRenderer();
+      stopMediaStream(stream.stream);
+    }
 
     onGroupCallEvent.add(GroupCallEvent.ScreenshareStreamsChanged);
   }

lib/src/voip/utils.dart

@@ -1,10 +1,11 @@
 import 'package:random_string/random_string.dart';
 import 'package:webrtc_interface/webrtc_interface.dart';
 
-void stopMediaStream(MediaStream? stream) async {
+Future<void> stopMediaStream(MediaStream? stream) async {
   stream?.getTracks().forEach((element) async {
     await element.stop();
   });
+  await stream?.dispose();
 }
 
 void setTracksEnabled(List<MediaStreamTrack> tracks, bool enabled) {