I think this old post needs some attention:
http://meta.stackoverflow.com/questions/170963/deleting-a-comment-with-the-add-comment-textarea-open-removes-the-textarea
There are a recent near-duplicates, but they're all status-completed, and this one isn't fixed
While I'm at it, for this:
http://meta.stackoverflow.com/questions/164381/editing-a-post-with-a-pending-edit-after-already-reviewing-20-edits
it seems like a feature request, but it's marked support, should I edit it with the feature-request tag or post a new question?