Shift doesn't work with korean+fcitx

[SJang1]

Version of OpenTTD

master and even before(a lot before)

Expected result

Input Korean with Shift works

Actual result

It doesn't recognize shift key.

Steps to reproduce

Same to #100 , with fcitx thing and SDL2.
Shift key doesn't work with hangul(korean) when using fcitx. (I've not checked the other methods)

Environment : Linux (Fedora 31 / Arch)

[JGRennison]

As far as I can tell, shift key presses are transmitted to fcitx, and it also works as a modifier key.
What is fctix supposed to be doing with the shift key, that it isn't doing?

[SJang1]

In korean, shift key is used to input things like 가 to 까 (add same letter twice if supported), and like on english, it needs to input $ than 4 like it, but those doesn't work.
(So, it works like as modifier key)

[JGRennison]

Does the shift key work in a non text-entry context, e.g. to to show a cost estimate instead of doing a command?

[SJang1]

In non-text entry context, it looks like it is fixed to english, and shift does work.