Mark a comment as answer to a question
I find that in many cases a comment I've made turns out to be the answer to the question. I suggest adding a "convert-comment-to-answer" button.
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Most of the times, comment doesn't fit as an answer, because comments are too short.
Sometimes it would be useful, though
However, I do not think this would ever become status-completed, because it's too simple to just copy your comment and put it as an answer instead