Why can’t you solve a question on the question. Yeah I know that sounds strange.
But if your question is actually “This is how you solve a problem” then the question is the answer and you should be able to show that this is the solution to feature visitors.
As it is now you can’t really “solve” such threads and they look unsolved, but they are solved.
And lets say you add the solved to another post in the thread (which there might not even be) then the “solved”-quote-thing that is added to the question does not make sense.
Nobody else that finds this strange/annoying?
