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

From: ndame <[email-masked]>
Date: Fri, 30 Jul 2021 04:18:51 +0000

>
> That would require it to wait until Diff has finished running before
> showing the window. Currently 'M-x diff' works asynchronously, which has
> its benefits.

If exit status is zero then diff should restore  the previous window config
automatically and show the message.