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
** Bug watch added: gitlab.gnome.org/GNOME/gtk/-/issues #2767
https://gitlab.gnome.org/GNOME/gtk/-/issues/2767
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https://bugs.launchpad.net/bugs/1808710
Title:
!xcb_xlib_threads_sequence_lost error with GTK2 applications
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