bug#20975: Replacing text add also the comma

[Eli Zaretskii]

> Date: Sat, 4 Jul 2015 22:31:45 +0100
> From: Artur Malabarba <bruce.connor.am@gmail.com>
> Cc: 20975@debbugs.gnu.org, Angelo Graziosi <angelo.graziosi@alice.it>
> 
> If no one has a different opinion, I'll add a clause so that a decomposition 
> is
> folded only if it contains at least one non-spacing character. (though I'm not
> sure how to check for this, at the phone right now). 

You could look at the character's 'canonical-combining-class' property
(should be non-zero).  Or you could look at its 'general-category',
and allow only those whose value is one of Mc, Mn, Me.