src/vs/workbench/browser/parts/editor/breadcrumbsPicker.ts/FileDataSource/hasChildren
class FileDataSource:	hasChildren(element: IWorkspace | URI | IWorkspaceFolder | IFileStat): boolean {
		return URI.isUri(element)
			|| isWorkspace(element)
			|| isWorkspaceFolder(element)
			|| element.isDirectory;
	}