src/vs/workbench/contrib/codeEditor/browser/outline/documentSymbolsTree.ts/DocumentSymbolNavigationLabelProvider/getKeyboardNavigationLabel
class DocumentSymbolNavigationLabelProvider:	getKeyboardNavigationLabel(element: DocumentSymbolItem): { toString(): string } {
		if (element instanceof OutlineGroup) {
			return element.label;
		} else {
			return element.symbol.name;
		}
	}