fix video attach to incorrect element when transceiver reuse #427
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When MediaStreamTrack been removed from MediaStream ,we emit event before setTrack, cause ui received
unsubscribed
event to render the participant. But the RemoteTrack holds a staleMediaStreamTrack
, when transceiver reuse involved, theMediaStreamTrack
might be added to other participant'sMediaStream
, that cause video track has been attached to incorrect element. If this participant don't have any subsequent track events fired, then ui don't have chance to render the correct track. This cause the video chaos issue on my local cluster kill node test