Scancode returns "0" for non-US keyboard layout

[mrvladus]

Godot version

3.3.4

System information

Ubuntu 20.04

Issue description

I have two keyboard layouts: Russian and US. I want to make WASD controls in game.
When I set layout to US everything working fine: keyboard shortcuts("Ctrl+S" etc.), setting WASD inputs, and InputEventKey scancode returns normal values(87 for "W", 65 for "A", 83 for "S", 68 for "D"). But when I set Russian keyboard layout keyboard shortcuts doesn't work, I can't set letter keys(WASD) in Input Map, WASD doesn't work even if i set it using US layout and then switched to Russian. It doesn't matter if layout is switched before launching Godot(or game itself) or after. And InputEventKey scancode returns 0 for ONLY keys with letters, other keys are not affected.

Steps to reproduce

1. Add second keyboard layout in Ubuntu 20.04 system settings(Russian)
2. Launch test project and play it
3. Set keyboard layout to US, try different keys. It should return non-"0" values.
4. Change layout to Russian, try letter keys again. It returns 0
5. Try keyboard shortcuts in editor - it doesn't work

Minimal reproduction project

KeyboardLocaleBug.zip

[Chaosus]

Duplicate of #49771