src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_registerNotebookOverviewRuler
class NotebookEditorWidget:	private _registerNotebookOverviewRuler() {
		this._notebookOverviewRuler = this._register(this.instantiationService.createInstance(NotebookOverviewRuler, this, this._notebookOverviewRulerContainer!));
	}