cde8517519
Editing curvemap generates an undo step but with text "unkown action". This is due to empty name and description on the button. Explictly add name during button definition, This way `ui_apply_but_undo/ui_apply_but_funcs_after` uses correct string for undo step. Pull Request: https://projects.blender.org/blender/blender/pulls/145717