Last modified: 2009-02-17 19:12:41 UTC
If two or more people make the same edit at the same time (whether rollback or a manual save of the equivalent text), only one of them will be recorded in the page history as the author of the revision.
However, the rollback "Action complete" message is often displayed even when the user is not the author of the revision recorded in the page history. This can be confusing.
*** This bug has been marked as a duplicate of bug 12873 ***