I'm asking about this answer: https://stackoverflow.com/a/3242364/2389310
One comment provided important missing data, and answer's author agreed on it. But he didn't edit it into an answer. Comments are meant to be ephemeral and short-lived, and this answer in FAQ (no downvotes) lead me to believe it is OK to edit information into the post. Why not, if post's author confirmed it should be there?
I don't want to start an edit war, so I ask here - was it a good edit or not? And was this rollback justified?