On macOS only, with some combinations of repeated keys, the action of releasing the first repeated key will cause the remaining repeated key to no longer call ReceivedCharacter.

Steps to reproduce:

1. Hold down j until it repeats
2. While still holding down j, hold down k until that repeats. (j's ReceivedCharacters will stop, superseded by k's ReceivedCharacters, as expected.)
3. Release j while still holding k. This causes k's ReceivedCharacters to stop.

Expected behavior:

1. Hold down j until it repeats
2. While still holding down j, hold down k until that repeats. (j's ReceivedCharacters will stop, superseded by k's ReceivedCharacters, as expected.)
3. Release j while still holding k. k's ReceivedCharacters should continue until k is released.

This causes much frustration to, say, vim and less users with "lazy fingers" while trying to scroll in a terminal emulator utilizing winit.

Note: This happens, strangely, only with some key combinations. For example, trying the above steps with a and s will not reproduce this problem.

This is likely to be the cause of alacritty/alacritty#2788