Last updated at 8:25 pm UTC on 24 March 2018
See comment in Editor.
My instances edit Text, this is, they support multiple lines and TextAttributes.
They have no specific facilities for editing Smalltalk code. Those are found in SmalltalkEditor.
TextMorph class has #defaultEditorClass. It may be set with #defaultEditorClass:
TextMorph defaultEditorClass: TextEditor.