> With GTK3 you can probably work around this by forcing X11, e.g.:
>
> env GDK_BACKEND=x11 /usr/bin/app

For many applications that might be a valuable hint. But it causes
hideous flicker, due to
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=934386.

Kind regards,

   Gunter.

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