GNU bug report logs - #20623
XML and HTML files with encoding/charset="utf-8" declaration lose BOM; Coding system is reset from utf-8-with-signature to utf-8 on save

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Message #29 received at 20623 <at> debbugs.gnu.org (full text, mbox):

From: Simon Ledergerber <sledergerber <at> gmx.net>
To: Eli Zaretskii <eliz <at> gnu.org>, Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 20623 <at> debbugs.gnu.org
Subject: RE: bug#20623: XML and HTML files with encoding/charset="utf-8"
 declaration loose BOM; Coding system is reset from utf-8-with-signature to
 utf-8 on save
Date: Sat, 23 May 2015 19:11:15 +0200

[Message part 1 (text/plain, inline)]

As already mentioned in my last post, even when I started Emacs with the option -Q, which should opt out my customizations, it made no difference. So naturally, the source of the problem will be somewhere else.

-----Original Message-----
From: "Eli Zaretskii" <eliz <at> gnu.org>
Sent: ‎23.‎05.‎2015 08:44
To: "Stefan Monnier" <monnier <at> iro.umontreal.ca>
Cc: "sledergerber <at> gmx.net" <sledergerber <at> gmx.net>; "20623 <at> debbugs.gnu.org" <20623 <at> debbugs.gnu.org>
Subject: Re: bug#20623: XML and HTML files with encoding/charset="utf-8"	declaration loose BOM; Coding system is reset from utf-8-with-signature to utf-8 on save

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: sledergerber <at> gmx.net,  20623 <at> debbugs.gnu.org
> Date: Fri, 22 May 2015 17:51:07 -0400
> 
> >> > What would you expect Emacs to do instead?  It just obeys the stated
> >> > encoding, which says nothing about the BOM.  How can Emacs know when
> >> > to use utf-8 and when utf-8-with-signature?
> >> To the extent that Emacs has seen the BOM when opening the file, it
> >> would make sense for Emacs to try and preserve this detail.
> > It does.
> 
> While there are cases where it does, this bug report is about a case
> where it doesn't, IIUC.

AFAIU, that happened because the user has this in ~/.emacs:

  (setq-default buffer-file-coding-system 'utf-8-dos)

IMO, this bad customization should be removed, and then the problem
will go away.

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