Last updated at 8:55 pm UTC on 2 May 2014
SketchEditorMorph is not meant to be instantiated by itself. It's only a
transient (modal) UI widget.
The false return from #includeInNewMorphMenu is there to prevent people
getting to it that way. This is similar to (say) AtomMorph.
Instead you would have a SketchMorph and tell it to edit:
(SketchMorph withForm: (Form extent: 100 at 100 depth: Display depth))
But I do agree that the SketchMorph/SketchEditorMorph stuff needs to be
cleaned up and reorganized.