removeAt method
Remove the child node at the index
The ValueListenable and removedNodes listeners will also be notified on this operation
Implementation
IndexedListenableNode removeAt(int index) {
final removedNode = super.removeAt(index);
_notifyListeners();
_notifyNodesRemoved(NodeRemoveEvent(List.from([removedNode])));
return removedNode as IndexedListenableNode;
}