src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_detachModel
class NotebookEditorWidget:	private _detachModel() {
		this._localStore.clear();
		dispose(this._localCellStateListeners);
		this._list.detachViewModel();
		this.viewModel?.dispose();
		// avoid event
		this.viewModel = undefined;
		this._webview?.dispose();
		this._webview?.element.remove();
		this._webview = null;
		this._list.clear();
	}