MacOS doesn't redraw while window resize is held but not moving

[markmurphydev]

Running the Quad example on MacOS on master, the window does not draw while the corner is held, but does draw while dragging it around to resize.

miniquad_quad.mov

This was introduced in #443

[markmurphydev]

I think this is relevant:
rust-windowing/winit#219

[markmurphydev]

So the general issue seems to be that when [ns_app sendEvent:event] gets a NSLeftMouseDown event that would resize the window, it switches into an internal event tracking run loop, which doesn't return control to macos::run until resizing is finished.

If you re-add the draw timer from before #443, but set the mode to NSEventTrackingRunLoopMode, it will draw while resizing, and the callback is only called while resizing.
I don't really know what the behavior is supposed to be for blocking_event_loop, but if you don't want it to draw continuously while resizing, you could create the timer only if it's not blocking.

I'm not sure how [ns_app run] redraws during resizing if it's also calling sendEvent.

[birhburh]

@markmurphydev, I wrote new implementation (basically copied it from android and ios)
https://github.com/birhburh/miniquad/tree/blocking_event_loop_osx
It is still raw but resize should work already
I'm still adding all messages processing

[markmurphydev]

I noticed that the window also freezes while any drop-down on the osx top menu bar is open, but this is also fixed by #462