maybePop inside children #24

Future<OctopusNode?> maybePopWithinChildren() {
    OctopusNode? result;
    return setState((state) {
      void removeLastInChildren(List<OctopusNode> children) {
        if (children.last.children.isEmpty) {
          children.removeLast();
          return;
        }

        return removeLastInChildren(children.last.children);
      }

      if (state.children.length < 2 && state.children.last.children.isEmpty) return state;

      removeLastInChildren(state.children);
      return state;
    }).then((_) => result);
  }