Readonly editorThe editor factory we need to include in CodeEditorWrapper.IOptions.
This is a separate readonly attribute rather than a factory method as we need to pass it around.
Create a new cell header for the parent widget.
Create a new cell header for the parent widget.
Create an input prompt.
Create a new markdown cell widget.
Create an output prompt.
A factory for creating notebook content.
Notes
This extends the content factory of the cell itself, which extends the content factory of the output area and input area. The result is that there is a single factory for creating all child content of a notebook.