bug#61667: 29.0.60; Failure to redisplay

[Po Lu]

It doesn't disable its compositor, it just unredirects fullscreen windows that 
it is 100% sure are opaque and obscuring all other managed windows.  If you 
want to test this, you will have to delete the opaque region change I asked you 
to apply.


>So this clearly points to a bug in the way GNOME handles the Emacs frame. 
>There's one last thing you could try: under GNOME, try the same experiment, 
>but with Emacs fullscreen.  I've read that GNOME automatically disables its 
>compositor when an app is fullscreen, but I'm not 100% sure that's the case.