src/vs/base/browser/ui/tree/objectTreeModel.ts/ObjectTreeModel/getElementLocation
class ObjectTreeModel:	private getElementLocation(element: T | null): number[] {
		if (element === null) {
			return [];
		}

		const node = this.nodes.get(element);

		if (!node) {
			throw new TreeError(this.user, `Tree element not found: ${element}`);
		}

		return this.model.getNodeLocation(node);
	}