xcb_io.c:269: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.

Hi,

I have this crash on a python3 script using gtk3 :

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
python: ../../src/xcb_io.c:269: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted

I found this merge on the same error :

!34 (closed)

You can see this basic program to reproduce it :

https://gitlab.freedesktop.org/aprovin/xcb-bug

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xcb_io.c:269: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.