GNOME: overlayed call controls are not accessible
Issue generated from Tuleap's migration script. Originally submitted by: Stepan Salenikovich (ssalenik)
Since the call control buttons have been moved into a gtk clutter actor to be overlayed on the video widget, they are no longer accessible via the keyboard because clutter does not handle tab navigation and focus chains. ie: you can't tab between the buttons to change focus.
It should also be verified that the buttons still retain their other a11y features correctly, ie: their a11y labels