gdk/wayland: Take transform into account when setting physical size
This is a backport upstream MR https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3515
With the script from
$ python3 bla.py
Pixel dims: 360, 720
mm dims: 65, 130
# rotate l5 to the side:
0|purism@nn:~ (master)$ python3 bla.py
Pixel dims: 720, 360
mm dims: 130, 65
Closes: #31 (closed)
Edited by Guido Gunther