The small catch is that MtkRegion (and pixman regions) "optimize away"
0-size rectangles, so a 0-sized region will always be seen as having
a 0,0 origin. We don't want that, so transfer the origin separately from
the region.
While at it, make the Wayland pointer lock use one such 0-size region,
to avoid the 1x1px wiggle room that it currently has (accounting for subpixel
motion).
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>
The min distance to the right/bottom edge depends on Wayland concepts
(wl_fixed_t) and eventually geometry scale. Move the logic the Wayland
side of the pointer constraints machinery to avoid the backend trying to
figure this out without the proper data.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2460>
There were some coordinate nudging to avoid running into Clutter
floating point math issues related to coordinate transformations. Over
the years these things have improved, especially with the move to
graphene, so remove the old work around.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2460>
