Do not call nextEventMatchingMask twice

wait_event used to call nextEventMatchingMask twice. Once with untilDate:distantFuture,
and dequeue:NO to wait until the next event but witout consuming it, and again with
untilDate:distantPast and dequeue:YES to retrieve the event (via poll_events).

For some reason, with osx 10.11, calling nextEventMatchingMask with dequeue:NO never
returns if the user scrolls, freezing the app.

So we now call nextEventMatchingMask only once, with dequeue:YES.

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