Function getExpandedNodes

src/cdk/tree/tree.spec.ts:1631–1633

(nodes: T[] | undefined, tree: CdkTree<T>)

}

function getExpandedNodes<T>(nodes: T[] | undefined, tree: CdkTree<T>): T[] {
  return nodes?.filter(node => tree.isExpanded(node)) ?? [];
}

function expectFlatTreeToMatch(
  treeElement: Element,