The FlaggedRevs extension display two diffs in one table row instead of two rows if you’re looking at the diff between two version and there is no difference (e. g. if you reverted some vandalism).
Version: 1.16.x
Severity: trivial
URL: http://de.wikipedia.org/w/index.php?title=Hans_Joachim_Sch%C3%A4dlich&action=historysubmit&diff=65352667&oldid=61888270