We did some work in https://bugs.webkit.org/show_bug.cgi?id=168751 to prevent the controls bar from disappearing while the captions menu is visible. But there were two remaining issues: 1. the controls bar would hide upon exiting the video. 2. clicking on the controls bar while the caption panel is up would hide the controls bar as well as the captions panel.
<rdar://problem/31320684>
<rdar://problem/31320685>
Created attachment 305730 [details] Patch
Created attachment 305731 [details] Patch
Comment on attachment 305731 [details] Patch Clearing flags on attachment: 305731 Committed r214545: <http://trac.webkit.org/changeset/214545>
All reviewed patches have been landed. Closing bug.