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MacOS UI: Video and UI deadlock when disabling and reenabling video track

callstack_deadlock_video_switch.log

Reproduction scenario:

  • play video (here webm VP9 video)
  • disable video track
  • re-enable video track
  • the player might not deadlock, then go back to disabling the video track

Pausing might help to reproduce the issue, but it's fairly random.

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