Suppose some post has been marked as "[duplicate]".
Next, suppose that the author of the post edits the post, and thereby makes a sufficiently convincing case for why the post is not a duplicate after all.
Is this all the author needs to do in order to have the "[duplicate]" designation removed?1
If not, what else must this author do in order for this to happen?
1 The only way I can imagine this would be the case is if any post that had been edited by its author af some point after being marked "[duplicate]" would get automatically flagged to those with the authority to remove the "[duplicate]" designation. This arrangment seems to me implausible somehow, but for all I know, that may be what happens.