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CGEventTap: Allow dropping events from callback #492

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This updates the return type of CGEventTapCallBackFn to allow for three options:

  • Replace returns a newly-constructed event. (equivalent to the existing Option::Some)
  • Keep returns the same event, possibly modified by the user callback. (equivalent to the existing Option::None)
  • Drop returns nullptr, stopping event propagation. (new)

@mattjbray
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Bump. I have tested this and it works well for me.

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