Code review comment for lp:~lukas-kde/unity8/defaultKeymap

This is WIP, need to test it out together with the Mir fix (currently in https://bileto.ubuntu.com/#/ticket/2003) if it doesn't clash with our surface-based approach.

I'd appreciate if someone could look at https://code.launchpad.net/~lukas-kde/qtmir/defaultKeymap/+merge/306519 first :)