There is a place where this code was called on the main thread.
We're using a rather nasty anti-pattern to just call a block inline rather
than synchonously calling it on the main thread if we're already on the main
thread. This code could use a good overhaul, but I don't have time to rip
it apart right now. This will address the immediate issue.
Fixes: https://github.com/XQuartz/XQuartz/issues/40
Fixes: https://github.com/XQuartz/XQuartz/issues/48
Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
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