It's annoying when you go to the "How do I?" forum page and then go into a topic only to find out that it's solved already. I would suggest that you remove the solved ones or sort them away to another section.
This would help a lot.
I disagree entirely.
The whole point is for people to look in that section for answers before posting a question.
It is generally 'forum etiquette' for the OP to amend the post with the addendum 'SOLVED'.
I've learnt more from the solved threads than anything else on this site (manual and tutorials included), so I'd strongly disagree that they should be removed. Going into a thread and finding that it's solved usually prompts me to see how it was solved, and add that little nugget of information to my own repertoire.
Moving them to a sub-forum would mean that they'd be neglected, relegated purely to searches. I enjoy reading through all threads in this section and if they're put off to the side then it'll just make it more of an effort to browse through them.
A "solved" tag, on the other hand, wouldn't be remiss.
Actually, giving it some thought I'd really appreciate a tag feature around here, and I think it'd be especially helpful for the newcomers. Tags like beginner, intermediate, advanced, physics, behaviour, UI and so on would be very useful to organise content at a glance, and could make searching a whole lot more powerful, too.
You have my vote for a "Solved" tag, but not for remove these threads :)
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I'm also going to chime in with disagreement, the How do I forum is a massive resource for solving problems, and with more complex queries there will often be more than one way of solving the problem: The first posted solution may not be the best.
Only thing that bothers me is the duplicate threads. I've never been to a forum with so many of the exact same topics :L
Yeah, I agree that a "Solved" tag would suit everybody. ;D