I didn't find the answer for a specific subquestion in a general question, so I asked the subquestion here, and it got closed as a duplicate. Since I already got the answer, I don't need to reopen it, but I didn't find any post with general guidelines for this specifically (there are similar questions on situation when the original, more general question is bad at all, such as here, but I think rewording just for sake of one special case might be different).
Should I edit the original question? Or ask in a comment?