title: how to warn against deleting folded subtree in org-mode?
body: <p>I'm editing content in emacs org-mode and using the header structure in both folded and unfolded modes. In editing, though, I'm worried I will accidentally delete a folded subtree containing content. </p>
  
  <p>Is there a way to get org-mode to warn me before deleting a folded subtree containing hidden content?  </p>