Since Windows 10 you can enable text suggestions while using the physical keyboard (though I didn't because it didn't cover my needs). Since some Windows 10 update it added multilingual text suggestions, though I never noticed until now. Anyway, because of that I enabled it. However, it appears it doesn't work in Qt-based applications!
Select a text field in a Qt-based application
Get suggestions to complete the current word or a complete suggestion for the next word.
There are no suggestions