backend/wayland: handle hidpi and subpixel
Hi, this is a patch to scale the wayland backend in case it's running on a compositor with screen scaling configured. Should handle multi-output configurations with different scales.
I also threw in a patch for passing through subpixel hints as that became trivial since all the footwork has been done
RFC: We might want to pass the scale further into the system so that nested applications running within know about the actual scale they are running at from the host compositor.
Edited by Alexander Orzechowski