Incorrect key composition/dead key behaviour on macOS #668
Description
On macOS, dead keys like ~ should be printed immediately with an underline indicating it can be composed with other keys. If another composable key is pressed it should be replaced by the composed character, otherwise it should remain as-is.
The current behaviour is to not print anything until the next key is pressed, where it'll either print a composed character or two separate characters, which is probably consistent behaviour across platforms, and at least is how I'd expect it to work on Linux with dead keys enabled.
It might be that this is an upstream issue with SDL2, that they've decided to provide a consistent experience across platforms, that they provide an optional API to implement this behaviour, or that Revery currently just don't use it properly.