I've just seen this in the edit queue:
If it's not the worst edit I've ever seen, it's certainly not far off. I was writing a custom rejection reason, and got the 'This edit has already been approved' message; so I poked around - it looks like it was approved by Community, because Johnsyweb went through and corrected it. He's got considerably more patience than I do.
But that means that the user earned himself rep for getting an edit approved. Is that by design?
It looks like this was caused by an edit clash, rather than a bad edit. I apologise for jumping to conclusions.