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

From: Alan Mackenzie
Subject: bug#22025: Emacs 25 corrupts Emacs 24 .emacs.desktop.
Date: Wed, 2 Dec 2015 11:27:22 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

Hello, Eli.

On Tue, Dec 01, 2015 at 08:46:51PM +0200, Eli Zaretskii wrote:
> > Date: Tue, 1 Dec 2015 17:01:38 +0000
> > Cc: address@hidden
> > From: Alan Mackenzie <address@hidden>

> > 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.

I'm a bit wary about NEWS.  How many people actually read it thoroughly?
At each new release, I try to read NEWS, but my eyes start glazing over
before I even get half way through.

But that aside, how about the following NEWS entry (to be followed by
actual code)?

** Desktop

*** The desktop format version has been upgraded from 206 to 208.
Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
cannot read a version 208 desktop.  To upgrade your desktop file, you
must explicitly request the upgrade by C-u M-x desktop-save.  You are
recommended to do this as soon as you have firmly upgraded to Emacs
25.1 (or later).  Should you ever need to downgrade your desktop file
to version 206, you can do this with C-u C-u M-x desktop-save.

An additional possibility would by to nag the user with a prompt in the
echo area after loading a 206 desktop.  Something like:

You have loaded an old format desktop file.  To upgrade it, see NEWS (C-h n).

, together with a variable to disable it.  Maybe.

Alan Mackenzie (Nuremberg, Germany).

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