private static @Nullable DefaultMutableTreeNode findPackageNode(DefaultMutableTreeNode rootNode, String qualifiedName) {
    for (int i = 0; i < rootNode.getChildCount(); i++) {
      DefaultMutableTreeNode child = (DefaultMutableTreeNode)rootNode.getChildAt(i);
      PsiPackage nodePackage = (PsiPackage)child.getUserObject();
      if (nodePackage != null) {
        if (Objects.equals(nodePackage.getQualifiedName(), qualifiedName)) return child;
      }
    }
    return null;
  }
private static @Nullable DefaultMutableTreeNode findPackageNode(DefaultMutableTreeNode rootNode, String qualifiedName)