9
In general, I would write a new question: significantly changing an existing one is likely confusing to users that have interacted with it and it feels wrong as soon as it is voted on or it has answers.
Of course, in this case it makes no big difference — there is currently one vote on the question and no votes on the only answer (a community wiki with you ...
4
I agree with fra-san that changing an existing question has risks. In this particular case, there are no other answers, and the existing answer is a self-answer, so I don't see any harm in editing the existing question to refine it.
Questions are free, however, so it'd also be reasonable to leave the existing Q&A (checking the box to accept it when you ...
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