src/vs/workbench/contrib/notebook/browser/contrib/outline/notebookOutline.ts/NotebookCellOutline/preview
class NotebookCellOutline:	preview(entry: OutlineEntry): IDisposable {
		const widget = this._editor.getControl();
		if (!widget) {
			return Disposable.None;
		}
		widget.revealInCenterIfOutsideViewport(entry.cell);
		const ids = widget.deltaCellDecorations([], [{
			handle: entry.cell.handle,
			options: { className: 'nb-symbolHighlight', outputClassName: 'nb-symbolHighlight' }
		}]);
		return toDisposable(() => { widget.deltaCellDecorations(ids, []); });

	}