21.5.28: Reverting a buffer leaves its status as modified

[Aidan Kehoe]

 Ar an chéad lá is fiche de mí Meitheamh, scríobh Stephen J. Turnbull: 

 > Ville Skyttä writes:
 > 
 >  > Reverting a buffer in 21.5.28 leaves the buffer's status as modified for me.
 > 
 > Yeah, I've reported this.  I think I have observed other operations
 > that should not change the modiff but do, but I can't reproduce.  I
 > don't know what's going on, but it goes back to at least 21.5.27
 > (+CVS-20070324).
 > 
 > Aidan and Mike are the ones to most recently touch the revert code,
 > but I observe the issue in builds earlier than their changes.

Okay, I’m committing a change that looks, umm, ‘obviously correct,’ that
should address Ville’s problem and may address Stephen’s, but I didn’t get a
recipe to reproduce the latter to better eliminate it. Please keep an eye
out for this issue, and send me personal mail if it arises with a build from
after today. 

-- 
On the quay of the little Black Sea port, where the rescued pair came once
more into contact with civilization, Dobrinton was bitten by a dog which was
assumed to be mad, though it may only have been indiscriminating. (Saki)