This PR adds the "Separate" operator from GPv2.
Changes:
In GPv2 there were three modes: Selected Point, Selected Strokes and Active Layer. For better consistency with meshes Separate Operator, there are now three modes:
- Selected (point or strokes is determined by mode selection)
- By Layers (not only the active one)
- By Materials (new)
Also Multiframe selection is now supported.
Pull Request: https://projects.blender.org/blender/blender/pulls/116715
d589251905