Bug#1025213: Issue upstream

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1025213

Bug#1025213: Mutter mr 2241

Problem is caused by mutter merge-request 2241: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2241 . Shadow buffer is only used at software rendering. Damage history is needed at copy from shadow buffer to onscreen, to synchronize buffers. I will open an issue upstream. "