Fix KEY_ALT not working on Linux

[McKay42]

The current workaround is to use the capslock key instead.

[Cherenkov11]

XK_Meta_L is what I use for ALT and works fine. (It's kind of weird, because supposedly the Meta key doesn't exist in modern keyboards, but XK_Alt_L doesn't work for me) what I think, is that the model that you can select for xkb change those "extras" keys. In my case xbk select pc105 by default for my keyboard.

[McKay42]

XK_Meta_L is what I use for ALT and works fine. (It's kind of weird, because supposedly the Meta key doesn't exist in modern keyboards, but XK_Alt_L doesn't work for me) what I think, is that the model that you can select for xkb change those "extras" keys. In my case xbk select pc105 by default for my keyboard.

(Just explaining in case anyone else stumbles upon this:)

The reason XK_Alt_L does not work by default is that most (Linux) window managers use it as the "drag window" hotkey, meaning that the game does not even receive any key event for it. Meaning, users would have to change operating system hotkeys in order to get it working.