Apparently it's a bug in libx11, which persisted for a long time but became much more likely with an update in libxcb. Please see the still open merge request/patch at
https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/34
Further reading: This bug report (as it turned out now, it's probably *not* a bug in gtk though): https://gitlab.gnome.org/GNOME/gtk/-/issues/2767
Apparently it's a bug in libx11, which persisted for a long time but
became much more likely with an update in libxcb.
Please see the still open merge request/patch at
https:/ /gitlab. freedesktop. org/xorg/ lib/libx11/ -/merge_ requests/ 34
Further reading: /gitlab. gnome.org/ GNOME/gtk/ -/issues/ 2767
This bug report (as it turned out now, it's probably *not*
a bug in gtk though):
https:/