static void ai_openMainParseInJTree(final JTree tree) {
  swing {
    ai_openMainParseInJTree(tree, jDynamicTree_root(tree));
  }
}

static void ai_openMainParseInJTree(JTree tree, DefaultMutableTreeNode n) {
  if (n == null) ret;
  tree.expandPath(new TreePath(n.getPath()));
  PTElement e = cast n.getUserObject();
  int count = n.getChildCount();
  if (!e instanceof ChoosePart) count = min(1, count);
  for i to count:
    ai_openMainParseInJTree(tree, (DefaultMutableTreeNode) n.getChildAt(i));
}

Began life as a copy of #1017433