To disable the spell checker on LineageOS using ADB, you can use the following command:
textadb shell
textsettings put secure spell_checker_enabled 0
This method is confirmed to work on various Android ROMs, including LineageOS, and will globally disable the spell checker for all text inputs.
If you encounter permission issues, you may need root access or to run the command as superuser (su) in the ADB shell.
Vibe can make mistakes. Check answers. Learn more