private DefaultMutableTreeNode findNodeForPackage(String qualifiedPackageName) {
    DefaultMutableTreeNode root = (DefaultMutableTreeNode)myModel.getRoot();
    Enumeration<TreeNode> enumeration = root.depthFirstEnumeration();
    while (enumeration.hasMoreElements()) {
      if (enumeration.nextElement() instanceof DefaultMutableTreeNode node) {
        PsiPackage nodePackage = (PsiPackage)node.getUserObject();
        if (nodePackage != null) {
          if (Objects.equals(nodePackage.getQualifiedName(), qualifiedPackageName)) return node;
        }
      }
    }
    return null;
  }
private DefaultMutableTreeNode findNodeForPackage(String qualifiedPackageName)