See Update Below
As a 10k+ user (on SO, not here), I'd like to be able to un-downvote a deleted answer. Details:
Like a lot of users who've been on the site(s) for a while, I don't downvote virtually anything right away. I comment saying what my problem is with the item and, if I'm not too busy and I'm still around later and
oh look a butterfly I don't get too distracted, I'll come back to see if it's been fixed or removed and downvote if called for.
Despite that, sometimes I downvote an answer and find later that the poster deleted it. Now, they could be deleting it because they don't want more downvotes, but that's fine by me, the goal is to have high-quality content on the site. Sometimes, though, it's clear that they've simply realized that they're wrong and so they're deleting the answer because it's wrong.
And when that happens, I'd like to be able to un-downvote the answer as a means of encouraging that behavior (deleting bad answers). (Re the questions below: No, it's not about reclaiming my rep. I don't care about that, particularly.) It's not like this is a burning item or high on the priority list, but I didn't see it suggested, so I'm suggesting it.
Update: According to Grace Note, the rep they lose will eventually come back to them. And so there's probably no need for this. Sure, it would make it more immediate, and maybe there's something to that if the change is as trivial to implement as it seems, but...