bug#49774: 27.1; if diff commands finds no differences then do not pop up a window

[Lars Ingebrigtsen]

Richard Stallman <rms@gnu.org> writes:

> New options like this provide an unending opportunity for increased
> featurism, and can make some operations more convenient for some users.
> But they won't extend the actual jobs that Emacs can handle.

I agree.  This is working as we intend this to work, and people that
prefer Emacs to do something else here can do that with an advice.

So I'm closing this bug report.