Recently I asked a question on Stack Overflow, but then found an answer on Computer Science Stack Exchange, so I posted a link in a comment (I would have felt bad answering my own question with a link to someone else's answer!) because it added value to the site. I would have liked to have a way to mark the question as answered even though nobody had posted an answer to the question.
I would like to discuss the idea of some feature along these lines.
Recently I asked a question on stack overflow, but then found an answer on computer science stack exchange
While copying the answer verbatim isn't right, there's nothing stopping you from referencing that answer, and giving credit to the poster and posting your own answer explaining how that helped you resolve the issue. Maybe drop a comment to OP mentioning this.
While a link only answer is bad there's often value in talking about not just the what but how it was applicable to your own specific situation. Also by writing a more fleshed out answer that references the other, you improve folks ability to find solutions in both your question/answer pair, and it'd act as a signpost to the answer that helped you.
Marking a question as resolved without an answer, even as a comment can have issues for us. What if the other answer is deleted, and we lose the wisdom of the ancients.
