Make shortcuts independent to layouts

[JarKz]

Hi y'all!

I met a problem with shortcuts like Ctrl-C, Ctrl-T and another on layouts other than English because in code gtk4 uses keyval on specific layout. For example, the keyval on any English layouts for letter 'c' returns always 99, but in Belarusian layout - 1747.

I tried to figure out with key codes which are fixed, but can't find any information about it and I don't want to enter into unsafe gtk4 code. So... I gave up with it.

Any idea to fix it?