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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [Emacs-diffs] master 0528a7c: Ensure that expand-file-name
 returns an absolute file name
Date: Tue, 09 Jul 2019 05:35:35 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvsgrgazra.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 08 Jul 2019 19:13:52 -0400
> Cc: emacs-devel@gnu.org
> 
> >     * src/fileio.c (Fexpand_file_name): Don't directly use the current
> >     buffer's default-directory if it is relative.  Instead replace it
> >     by its expansion relative to invocation-directory.  (Bug#36502)
> 
> I don't think invocation-directory is a better choice than any
> other directory.  A relative `default-directory` value is an error.
> We should signal that error rather than try and paper over it.

In the bug discussion I explained why I thought this alternative was
better.