Hans de Goede authored Sep 17, 2017 and Carlos Garnacho committed Sep 22, 2017

When rotating 90/270 degrees we need to swap width and height. This fixes
the screen going black and the following errors showing in the journal:

gnome-shell[1097]: Failed to set CRTC mode 800x1280: No space left on device
gnome-shell[1097]: Failed to flip: Device or resource busy
gnome-shell[1097]: Failed to set CRTC mode 800x1280: No space left on device
gnome-shell[1097]: Failed to set CRTC mode 800x1280: No space left on device

When rotating a tablet with accelerometer 90/270 degrees.

https://bugzilla.gnome.org/show_bug.cgi?id=787836