5

Okay, here's a fairly obscure one.

Normally, if you edit a post, then undo all your changes again within the grace period (manually that is, rollback doesn't work), the revision will be silently deleted.

However, if the last editor was Community, typically because the question was closed as a duplicate, then it doesn't happen, and an empty revision stays behind. Strangely enough, it has to be Community; anonymous editors don't count.

An example of these empty revisions can be seen here (revision 3, click the third button in the left).

  • Was playing around with nasty roll-backing, apparently one can rollback to the revision of another question. :S – Tamara Wijsman Mar 19 '12 at 15:07
  • @TomWijsman Well that's not terribly relevant, but you should report that. – a cat Mar 19 '12 at 15:14
  • Not really, because this can be useful as long as it has no side effects. – Tamara Wijsman Mar 19 '12 at 15:24

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