src/vs/workbench/contrib/notebook/browser/notebookEditor.ts/NotebookEditor/_updateReadonly
class NotebookEditor:	private _updateReadonly(input: NotebookEditorInput): void {
		if (this._widget.value) {
			this._widget.value.setOptions({ isReadOnly: input.hasCapability(EditorInputCapabilities.Readonly) });
		}
	}