Simula exhibits "stuck" keypresses when being ran under rr (or other heavy loads)

[georgewsinger]

From Simula Chat:

Also I dont know if I should raise this but Im getting random inputs in firefox. I cant reduce in desktop so its not my keyboard but itll send periods on whatever entry is focused.

I think this frequently corresponds with the Xwayland error message:

Key repeat discarded, Wayland compositor doesn't seem to be processing events fast enough!

It makes capturing rr traces significantly difficult, especially with firefox.