Incorrect behavior of CGEventTap

[adamnemecek]

I believes that the behavior of CGEventTap is not correct.

core-foundation-rs/core-graphics/src/event.rs

Line 437 in d7879eb

None => event,

I think that if the callback returns NULL, the event is supposed to be cancelled

https://developer.apple.com/documentation/coregraphics/cgeventtapcallback?language=objc