src/vs/editor/contrib/documentSymbols/browser/outlineModel.ts/OutlineModel/_makeOutlineElement
class OutlineModel:	private static _makeOutlineElement(info: DocumentSymbol, container: OutlineGroup | OutlineElement): void {
		const id = TreeElement.findId(info, container);
		const res = new OutlineElement(id, container, info);
		if (info.children) {
			for (const childInfo of info.children) {
				OutlineModel._makeOutlineElement(childInfo, res);
			}
		}
		container.children.set(res.id, res);
	}