src/vs/base/common/resourceTree.ts/ResourceTree/getNode
class ResourceTree:	getNode(uri: URI): IResourceNode<T, C> | undefined {
		const key = this.extUri.relativePath(this.root.uri, uri) || uri.path;
		const iterator = new PathIterator(false).reset(key);
		let node = this.root;

		while (true) {
			const name = iterator.value();
			const child = node.get(name);

			if (!child || !iterator.hasNext()) {
				return child;
			}

			node = child;
			iterator.next();
		}
	}