bug#22025: Emacs 25 corrupts Emacs 24 .emacs.desktop.

[Eli Zaretskii]

> Date: Tue, 1 Dec 2015 17:01:38 +0000
> Cc: 22025@debbugs.gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> I think we need some way of alerting all users to the change.  Otherwise
> we could end up with lots of users never upgrading their desktops at
> all, which would be a shame.  The trouble is, we also need some way of
> not alerting the users too often, and then we're coming back to some
> sort of variable, if not a defcustom.

I think NEWS is the appropriate place to alert them to this.