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

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