X11 eventually punted the whole thing to each individual application. For input methods like Fcitx or IBus to work reliably on modern X11 programs, you need to

X11 eventually punted the whole thing to each individual application. For input methods like Fcitx or IBus to work reliably on modern X11 programs, you need to set envvars like the following [0]: GTK_IM_MODULE=fcitx QT_IM_MODULE=fcitx SDL_IM_MODULE=fcitx [0]: https://wiki.archlinux.org/title/Fcitx5#IM_modules https://wiki.archlinux.org/title/Fcitx5#IM_modules