... for Grease Pencil & Curves
Was only moving the points relative to the origin (so only they stayed
in place, handles were still transformed along with the origin).
In order to fix this this, we now take into account curves handles in
the whole `XFormObjectData` related code (for both Grease Pencil &
Curves). There was a handly existing pair of functions
[`curves::bezier::retrieve_all_positions` &
`curves::bezier::write_all_positions`] which we can use for Curves, for
Grease Pencil this uses code from those functions (but not the functions
directly -- indices would fail there because Grease Pencil would call
this from multiple layers).
This also introduces `BKE_grease_pencil_has_curve_with_type` so we can
know in advance how many elements we need for the
`XFormObjectData_GreasePencil`.
Also corrects a typo in c1c67c918e (swapping `XFormObjectData_Curves`
with `XFormObjectData_GreasePencil`)
Pull Request: https://projects.blender.org/blender/blender/pulls/138665
82e557eb21