Wouldn't it be great if I asked a question, someone comments, below the question, then if any other comments answer the question, I could click a button and mark it as an answer and the whole comment could be the actual answer :) Which a tick or something like that just would save some time :)
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I'd have to see numbers on how often this happens before I'd get behind it. Sure, I've seen it before, but it's a tiny fraction of questions that get answered in the comments. I don't know if we need a new feature to deal with a small fraction of cases, particularly when most of those can be rectified by asking the commenter to post an answer. (I've done this before. If you leave them a comment telling them you want to upvote their answer, people usually jump right on it.)