bug#25362: 26.0.50; comment-region goes into an infinite loop

[Eli Zaretskii]

> Date: Fri, 6 Jan 2017 09:32:37 +0000
> Cc: dima@secretsauce.net, 25362@debbugs.gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> > Is this bug new in Emacs 25.1?
> 
> Yes, it is.  I've just tried the scenario out on Emacs 24.5, and it
> works OK there.

Then it would be good to have a safe enough solution that we could
install on the release branch, or, failing that, a safe workaround.

Thanks.