Issue found on Dawiki - https://da.wikipedia.org/wiki/Speciel:Version
Recently, I've experienced that I get the MediaWiki:Alreadyrolled-message, when I'm using rollback on edits that, in the end, has no diff.
To clarify: User A adds some content in edit 1, some more content in edit 2 and then removes it all in edit 3.
Thus there is no difference between the article before and after the edits.
I find that I can't just perform a rollback, with the added benefit of marking the edits patrolled, anymore.
This seems to be a regression, as that has been possible before.
I've created a little testpage on https://da.wikipedia.org/wiki/Bruger:Knud_Winckelmann/rollbacktest, illustrating the above mentioned scenario.