src/vs/base/browser/ui/tree/asyncDataTree.ts/AsyncDataTree/getNode
class AsyncDataTree:	getNode(element: TInput | T = this.root.element): ITreeNode<TInput | T, TFilterData> {
		const dataNode = this.getDataNode(element);
		const node = this.tree.getNode(dataNode === this.root ? null : dataNode);
		return this.nodeMapper.map(node);
	}