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Fcitx 5 engine can be distributed via Flatpak.

https://fcitx-im.org/wiki/Install_Fcitx_5#Install_Fcitx_5_from_Flatpak
https://github.com/flathub/?q=org.fcitx.Fcitx5&type=all&language=&sort=

To support flatpak, usually it need to support:

1. Non-hardcoded path to load data, since it need to be installed to a special prefix. It can be hardcoded at compile time, but I don't really suggest that, since if you want also android support, it has to be based on the XDG_* path.
2. Icon naming

• Flatpak does not allow icon to be exported by addon. -> main Fcitx flatpak package has to bundle all icon (https://github.com/fcitx/flatpak-fcitx5/blob/4dfb22440dde4f3f76a642b6b48074f76e85b605/org.fcitx.Fcitx5.yaml#L134), as you can see we also bundle some 3rd party engine icon if they request (mcbopomofo).
• DBus System tray (e.g. the one used by KDE) can only load icon from host.
• Only icon named after the flatpak package name can be exported by flatpak, that's why all icons used by fcitx are named like org.fcitx.Fcitx5.****.png .

Reference: https://github.com/fcitx/flatpak-fcitx5/

Issue reported in Telegram group: https://t.me/varnamproject/3462

Also one more thing: Learn words checkbox

cc @anoopmsivadas

1. Up/down arrow keys should move the candidates cursor without needing to press Alt
2. Preedit should be kept in English, left/right arrow should move cursor normally along the preedit
3. 0 should commit the preedit itself
4. Esc should close the candidate window
5. Home/End should move cursor to beginning/end in the preedit
6. Handle backspace/delete key

Engine may get android support for free via https://github.com/fcitx5-android/fcitx5-android @subins2000

Though the build process is trickier to handle.

For now, it might be easier, if the build system is based on CMake, due to NDK's official cmake support. I'm not sure if it's easy to keep using meson.

Some reference resource:
https://github.com/fcitx5-android/prebuilder/ is used to build any library and data it needs.
https://github.com/fcitx5-android/fcitx5-android/tree/master/plugin for holding the extra build files used to build the plugin.

https://codedocs.xyz/fcitx/fcitx5/capabilityflags_8h.html