Last modified: 2013-05-18 13:50:16 UTC
'Review and save' is enabled on loading an old version of a page (as it should) but becomes disabled briefly after the first transaction is committed, and again if you undo to the top of the stack.
Related URL: https://gerrit.wikimedia.org/r/64372 (Gerrit Change I67c011ac655d4e553f9467cab10a875aaac61d03)
Merged; will go out with wmf5.