The error handling added in r228115 can cause Safari to be unresponsive when returning from Auto-PiP.
<rdar://problem/37685981>
Created attachment 334281 [details] Patch
Comment on attachment 334281 [details] Patch Clearing flags on attachment: 334281 Committed r228824: <https://trac.webkit.org/changeset/228824>
All reviewed patches have been landed. Closing bug.