odd edit behavior

Question

A user submitted an edit for his post with the comment "edited tags":

https://stackoverflow.com/posts/6528592/revisions

But it looks like nothing at all changed:

(c and concurrency were there with the first version of the post.)

Answer 1

The user added some tags, then edited again to remove the new tags. Because this was done in the 5 minute "quick edit" window, it appears as if nothing changed.

We'll look at just destroying the null edit in these cases.

Answer 2

We've since revised our solution here from Jarrod due to exploits as explained elsewhere. Now, any null edits of this sort will instead be an empty revision but explicitly state "Edit removed during grace period".