src/vs/workbench/contrib/notebook/common/notebookEditorModel.ts/SimpleNotebookEditorModel/dispose
class SimpleNotebookEditorModel:	override dispose(): void {
		this._workingCopyListeners.dispose();
		this._workingCopy?.dispose();
		this._onDidChangeDirty.dispose();
		this._onDidSave.dispose();
		this._onDidChangeOrphaned.dispose();
		this._onDidChangeReadonly.dispose();
		super.dispose();
	}