I've twice now in the last 24 hours had a user delete his/her question while I was busy typing up an answer. I had no indication while writing the answers that the question was deleted while writing out my answer. This is obviously hugely frustrating.
Can we perhaps get a notification that the question we're answering has been deleted, kind of like the "X new answers" notification?
Also, what happens if the question is later undeleted? Perhaps we should allow questions to be answered within X minutes of being deleted, such that the answers we spent time on don't go to complete waste.