I had added an optimization to not pass messages to main thread every time the CVDisplayLink timer fired, unless a render frame for that monitor was actually requested. However, this optimization is impossible to implement wihtout a deadlock since CVDisplayLink has its own internal lock that it does not expose. So I guess macOS users with multiple monitors will simply have to take the performance hit of useless wakeups sixty times a second for every extra monitor. Fixes #1779
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