Quite a few comments!!!! Cool! Anyway, my suggestion is only meant as something voluntary.... we should all police our own threads, marking them as "[RESOLVED]" whether something is a workaround or a hard and fast concrete answer that fixes an issue. (Where would we be without those workarounds ??). And.... regardless of where the threads finally get placed, just re-editing the original post of a thread would really help others to know that something was fixed and that the reply or replies fixed someone's problem or question.
I just think it should be used as a suggestion..... after a while, users will start using it, and policing will take care of the rest who don't mark fixed threads as "[RESOLVED]"
Have a great day