Allow selecting keys by pressed arrow keys

[PureTryOut]

I'm thinking of being able to use Maliit for Plasma Bigscreen. Currently they use Qt5VirtualKeyboard as that allows navigating the keyboard using key navigation. They require to be able to accept input from remote (TV) controls which often only have arrow keys available, and they emulate the arrow keys from a keyboard.

[jpetersen]

Yes a good idea for an use case not 100% sure how it works with focus etc to get the input events.

But I think we should support it in general

[plata]

Having the "up" key in terminal would also be very helpful.

[dobey]

This was also opened at https://invent.kde.org/plasma/plasma-bigscreen/-/issues/16 for that side of things