[3.x] Use SpinLock instead of Mutex for X11 events thread safety #49720
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Draft PR to test a potential fix for #48369.
Uses
SpinLockinstead ofMutexto lock events processing, to see if that could prevent long stalls to happen. I haven't reproduced the issue so far so I'm not sure if that's the actual cause.If it helps, a separate PR will be needed to do the same change on master.