Bug#1025213: Issue upstream

[Gert van de Kraats]

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

Bug#1025213: Mutter mr 2241

[Gert van de Kraats]

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.
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