I was typing a comment under a question, and the owner deleted the question while I was in the middle of typing. This killed the text I had typed so far, and now I can't get it back. This seems like suboptimal design to me. Someone else's action should not delete the text I was typing, with no way for me to recover. (Note that I am a moderator so I can post comments on deleted posts.)
Here's the specific situation where this happened. I closed a question, and then was in the middle of typing a comment to explain why it was closed and how the poster could improve their question. The poster deleted their question immediately, before I could finish the comment. This is the second time it has happened to me.
Now I suppose we could say, if the poster doesn't care about their question, then there's no use in posting a comment anyway. However, it still feels unfriendly to trash what I've typed so far, without warning, and without possibility of recovering it.
So, that's the problem. Better behavior would be: if the question is deleted, and I'm in the middle of typing a comment, then preserve the comment text if I 'click to refresh'. Alternatively, if the question is deleted while I'm typing a comment, don't pop up a notice that prevents me from getting to my text; let me save it by copy-paste before clicking to refresh.