Make the prepare function a vfunc of MetaCursorSprite, moving the root
cursor prepare function into MetaCursorSpriteXcursor. This should solve
two issues:
- The root cursor prepare function was changed in f77d8e2a12a07ef6abe9
to solve an issue with fractional scales. The tool cursor prepare
function was missing this fix.
- The cursors created via the shape protocol had no prepare function at
all, so were not getting scaled.
Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3975
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4345>
b08cf5c135