Focus position isn't restored after an application switch

[a11cf0]

Currently, when switching from and then back to an NWG application window the keyboard focus isn't given to the control it was previously on. Instead, it always goes to the parent window.

[cyrmax]

I totally agree with @a11cf0 ! Propper focus behaviour is vital especially for blind and visually impaired users who interract with UI only with keyboard and screen reader.