Just been following a question where the OP added a new post with the same question rephrased, which is I believe frowned upon. I'm just about to suggest he edits his original question by adding clarifications, more detail etc, and to explain that this action refreshes his question in the list, but just wanted someone to confirm for me that this is actually the case.
No. It doesn't. But it push it to the top of Active questions list
If OP added a new post with the same question rephrased, you can flag it as exact duplicate of his/her original question. And add a comment to a new post to edit original post instead of adding new one.