It'll be nice if a notification is displayed when you're writing an answer to a question and someone else votes it as a dupe. Today, I answered a question and when I submitted, I noticed that it's being voted as an exact duplicate. It was indeed a duplicate so I deleted my answer and voted as a dupe. It would be nice to have notifications like the one that says "2 new answers added to the question" for duplicate votes and closing too.
Agreed. If we're embracing the Fastest Gun in the West, this can certainly be aggravating. I know I always answer the question as fast as I can unless I know that I've seen the question before--I'm not actively checking for dupes. So a little, "Hey, you're wasting your time" banner would be fantastic. Especially because I'm verbose and I like to write a treatise on the most mundane of topics.
I like this idea... not deleting the question is ok (as Jeff stated, this serves the purpose of incrementing the chances of finding a question when you search with different words), but all the answers should be in the original.
That way if you find a question with no answers, you can click on the possible duplicates link and find them all in one place