GNU bug report logs - #37580
26.3; setting buffer as unibyte temporarily may change buffer contents

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Package: emacs;

Reported by: ynyaaa <at> gmail.com

Date: Wed, 2 Oct 2019 09:44:01 UTC

Severity: normal

Tags: notabug

Found in version 26.3

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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Message #8 received at 37580 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: ynyaaa <at> gmail.com
Cc: 37580 <at> debbugs.gnu.org
Subject: Re: bug#37580: 26.3;
 setting buffer as unibyte temporarily may change buffer contents
Date: Wed, 02 Oct 2019 18:14:43 +0300

> From: ynyaaa <at> gmail.com
> Date: Wed, 02 Oct 2019 18:43:45 +0900
> 
> 
> If a multibyte buffer contains eight-bit character sequences,
> evaluating the form
>  (progn (set-buffer-multibyte nil) (set-buffer-multibyte t))
> may convert them to multibyte characters.
> 
> Afterwards, buffer-undo-list may be inappropriate.
> Undo in the form below changes the position of character '1'.

I don't think this is a bug.  Changing the multibyte-ness of a buffer
really does change the contents.  You should only do that where it
makes sense.
This bug report was last modified 5 years and 263 days ago.

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