src/vs/base/browser/ui/tree/compressedObjectTreeModel.ts/CompressedObjectTreeModel/getParentNodeLocation
class CompressedObjectTreeModel:	getParentNodeLocation(location: T | null): T | null {
		const compressedNode = this.getCompressedNode(location);
		const parentNode = this.model.getParentNodeLocation(compressedNode);

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

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