Assign active material to selected strokes. This is similar to legacy GP operator `GPENCIL_OT_stroke_change_color`. Implements #113481 Pull Request: https://projects.blender.org/blender/blender/pulls/113573
Assign active material to selected strokes. This is similar to legacy GP operator `GPENCIL_OT_stroke_change_color`. Implements #113481 Pull Request: https://projects.blender.org/blender/blender/pulls/113573