src/vs/base/browser/ui/tree/compressedObjectTreeModel.ts/CompressedObjectTreeModel/getNodeLocation
class CompressedObjectTreeModel:	getNodeLocation(node: ITreeNode<ICompressedTreeNode<T>, TFilterData>): T | null {
		const compressedNode = this.model.getNodeLocation(node);

		if (compressedNode === null) {
			return null;
		}

		return compressedNode.elements[compressedNode.elements.length - 1];
	}