The following sequence caused early migration complete declaration
1. Audio track received
2. Audio track published callback in progress
3. Video track received, this clears the pending track
4. Audio track published callback finishes. This checks for pending
tracks. As nothing is pending migration complete declared.
5. Due to the above, the remote video track is closed as not resuming.
That causes an unsubscription.
Fix
- Wait till publish callback to finish to remove a track from pending
fully.
- Introducing a new map as pending tracks is used in OnClose too. So,
did not want to delay removing from it as a close could happen while
publish callback is happening.
Also, moving the publish callback to a go routine (just like the recent
change for running those in a go routine for migrated muted tracks)
bdc515774e