bug#25105: 26.0.50; diff navigation is broken

[Eli Zaretskii]

> From: Dima Kogan <dima@secretsauce.net>
> Date: Thu, 05 Jan 2017 20:16:12 -0800
> Cc: 25105@debbugs.gnu.org, Dmitry Gutov <dgutov@yandex.ru>,
>       Tino Calancha <tino.calancha@gmail.com>, npostavs@users.sourceforge.net
> 
> I consider the current behavior a significant improvement in usability,
> but if there's a consensus that it's a step backward, then I'll go back
> to carrying this patch in my local tree.

Another alternative is to have a customizable option which will let
users decide what behavior they want.

Thanks.