glimagesink crash for thread error

[RiccardoCagnasso]

I'm using playbin in python3 with glimagesink as a videosink.
Every time the pipeline goes through a PLAYING -> NULL -> PLAYING cycle, the
player has a random chance of crashing with

 [xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not
been called
[xcb] Aborting, sorry about that.
python: xcb_io.c:165: dequeue_pending_request: Assertion
`!xcb_xlib_unknown_req_in_deq' failed.

error. This happens only on computer with intel video cards.
The problem is probably related to this old bug
https://lists.freedesktop.org/archives/gstreamer-bugs/2014-June/126812.html

Strange thing is that I'm calling Gobject.threads_init() and as the very
earliest thing in process.



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