Last modified: 2011-04-14 15:13:40 UTC
It is not possible to undo the edit of a section after adding a new one.
Steps to reprocue:
* UserA added a new sectionA on PageA
* UserB is adding a sentence to the sectionA
* UserC added a new sectionB on PageA
* UserD undo change of UserB and get a warning
The adding of a new section is counted as change to the previous section, so the warning appears, that it is not possible to undo that change.
See also bug 22783