In terms of badges such as Copy Editor, does using the "retag" button on a question count as making an edit?
Short Answer: No– Chris SJul 10, 2011 at 1:09
Please see this question on meta.stackoverflow: Does retagging a question count as an edit for Strunk & White? and this question: What kind of edits contribute to the editor badges?
Retagging is just changing the tags, not making a change to the post body. So a retag is not counted as an edit.
1You can't earn rep from meta.SF; but thank you for restating what others have already said.– Chris SJul 11, 2011 at 18:21