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backend-x11: Reintroduce XInitThreads
It was removed in 3.34 as part of 6ed5d2e2
. And we thought that was the
only thread that might exist and use X11. But the top gnome-shell crasher
in 3.36 seems to suggest otherwise.
We don't know what or where the offending thread is, but since:
1. We used XInitThreads for years already prior to 3.34; and
2. Extensions or any change to mutter/gnome-shell could conceivably use
threads to make X calls, directly or indirectly,
it's probably a good idea to reintroduce XInitThreads. The failing assertion
in libx11 is also accompanied by a strong hint:
```
fprintf(stderr, "[xcb] Most likely this is a multi-threaded client " \
"and XInitThreads has not been called\n");
```
https://bugs.launchpad.net/bugs/1877075
Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1252
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1256
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@ -855,6 +855,7 @@ meta_backend_x11_class_init (MetaBackendX11Class *klass)
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static void
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meta_backend_x11_init (MetaBackendX11 *x11)
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{
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XInitThreads ();
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}
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Display *
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