This now results in windows being painted on the screen. However, input is
still ending up in all the wrong places, and there is a lot of garbage content
being painted outside the actual windows.
Right clicking on a window seems to trigger rotate behavior, which needs to
be evaluated and likely removed (or prevented, if this is done by Weston).
Interestingly, checking for ->configured on first surface commit also seems to
break the backend.
41b2d294ed