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e339a57ddf
It isn't immediately obvious that this is impossible, because there's some
"action at a distance" going on with framebuffers that have their size
set lazily, after their textures get allocated; so let's make this a
critical warning rather than crashing.
In particular, this works around a crash when gnome-shell tries to blur a
background that hasn't yet had any space allocated for it - which it seems
is really an actor layout bug, but more robustness seems good to have.
Workaround for <https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2538>.
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1172
Signed-off-by: Simon McVittie <smcv@debian.org>
(cherry picked from commit c389aadff9)