Native emacs input method and GUI app text field entry and exit monitor with Fcitx5 via dbus

[QiangF]

It has been reported that external input method works in other GUI app, but does not work in buffers of the EXWM window manager emacs:
ch11ng/exwm#396
ch11ng/exwm#805

Probably due to the EXWM window manager emacs inherited these environment variables:

export GTK_IM_MODULE=fcitx
export QT_IM_MODULE=fcitx
export QT4_IM_MODULE=fcitx
export XMODIFIERS=@im=fcitx

The workaround is to communicate with the externel input method with dbus using imbot https://github.com/QiangF/imbot/, this will work no matter what environment variables are.
and to prevent the input method from getting emacs' keys, launch EXWM window manager emacs with:

Exec=env exwm_enabled=true GTK_IM_MODULE="" QT_IM_MODULE="" SDL_IM_MODULE="" INPUT_METHOD="" XMODIFIERS='@im=""' dbus-launch emacs -mm --debug-init

This will also serve as a solution for QT5 and QT6 apps, as it is reported that exim doesn't support Qt5 ch11ng/exim#6

However there are some issues with simulation keys. The window manager emacs and the input method seems to be competing for the keyboard input. I can not reproduce reliably.

And during searching for the solution, I find https://github.com/sinic/autocharmode , which Toggle EXWM char-mode automatically only in text fields of GTK 3. Since fcitx5 works for all GTK and QT versions, maybe use fcitx5 dbus interface signal to get the automatic toggle in text fields for all GUI apps.

[QiangF]

Update:
sinic/autocharmode#1
agzam/exwm-edit#34