The source project of this merge request has been removed.
We need an environment variable to let us know whether
the input method framework currently in use is fcitx4 or fcitx5.
"Append SDL_IM_MODULE=fcitx for some games (like Dota2) that use a vendor-modified version of SDL2 library."
copy from https://wiki.archlinux.org/title/Fcitx5