Fix restartTrack causing crash on disconnect (#361)

@@ -787,10 +787,14 @@ internal constructor(
 
             if (track != null) {
                 track.stop()
-                unpublishTrack(track)
+                unpublishTrack(track, stopOnUnpublish = false)
 
                 // We have the original track object reference, meaning we own it. Dispose here.
-                track.dispose()
+                try {
+                    track.dispose()
+                } catch (e: Exception) {
+                    LKLog.d(e) { "Exception thrown when cleaning up local participant track $pub:" }
+                }
             }
         }
     }

@@ -226,9 +226,15 @@ constructor(
         oldCapturer.dispose()
         oldSource.dispose()
 
-        // sender owns rtcTrack, so it'll take care of disposing it.
         oldRtcTrack.setEnabled(false)
 
+        // We always own our copy of rtcTrack, so we need to dispose it.
+        // Note: For the first rtcTrack we pass to the PeerConnection, PeerConnection actually
+        // passes it down to the native, and then ends up holding onto a separate copy at the
+        // Java layer. This means our initial rtcTrack isn't owned by PeerConnection, and is
+        // our responsibility to dispose.
+        oldRtcTrack.dispose()
+
         // Close resources associated to the old track. new track resources is registered in createTrack.
         val oldCloseable = closeableManager.unregisterResource(oldRtcTrack)
         oldCloseable?.close()
@@ -253,7 +259,7 @@ constructor(
         rtcTrack = newTrack.rtcTrack
         this.options = options
         startCapture()
-        sender?.setTrack(newTrack.rtcTrack, true)
+        sender?.setTrack(newTrack.rtcTrack, false)
     }
 
     internal fun setPublishingLayers(