src/vs/workbench/contrib/notebook/browser/notebookEditorToolbar.ts/NotebookEditorToolbar/_updateScrollbar
class NotebookEditorToolbar:	private _updateScrollbar() {
		this._pendingLayout?.dispose();

		this._pendingLayout = DOM.measure(() => {
			DOM.measure(() => { // double RAF
				this._leftToolbarScrollable.setRevealOnScroll(false);
				this._leftToolbarScrollable.scanDomNode();
				this._leftToolbarScrollable.setRevealOnScroll(true);
			});
		});
	}