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From: Juri Linkov <juri@jurta.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [Emacs-diffs] trunk r116304: * lisp/desktop.el (desktop-read):
	Claim the lock when the owner is not the current process.
Date: Sat, 08 Feb 2014 12:11:18 +0200
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Cc: Eli Zaretskii <eliz@gnu.org>, Emacs developers <emacs-devel@gnu.org>
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>> The one that comes last wins.
>
> Why is that better? I often start a second Emacs instance, and in
> almost all cases I want the first one to keep the desktop.
>
> What problem is that trying to fix, and why isn't
> desktop-load-locked-desktop enough?

The problem was that when a session crashes, all subsequent sessions
can't auto-save the desktop since they didn't take the lock
from the crashed session.