The changes for bug 187623 cause the PiP window to close when switching tabs.
<rdar://problem/41212379>
Created attachment 345843 [details] Patch
<rdar://problem/42626485>
rdar://problem/42599543
Comment on attachment 345843 [details] Patch Clearing flags on attachment: 345843 Committed r234264: <https://trac.webkit.org/changeset/234264>
All reviewed patches have been landed. Closing bug.