Add single-threaded deadlock detection to RwMutex #1619
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Closes #1560
It only works for single-threaded environments (double-locking the same
RwLockon the same thread), but it was what helped me find the problem in #1618It slows down the app a lot, but at least on my mac it is fast enough to be interacted with, so if your app freezes you can recompile with the
deadlock_detectionfeature and try to reproduce.