[iOS] Fullscreen video becomes unresponsive after repeated PiP operations
<rdar://problem/117099076>
Pull request: https://github.com/WebKit/WebKit/pull/19591
Committed 269842@main (0be7e2dbbc9c): <https://commits.webkit.org/269842@main> Reviewed commits have been landed. Closing PR #19591 and removing active labels.