GNU bug report logs - #75415
31.0.50; quoted-printable-en/decode-region doesn't preserve end markers

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Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Tue, 7 Jan 2025 04:25:02 UTC

Severity: normal

Found in version 31.0.50

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Report forwarded to monnier <at> iro.umontreal.ca, bug-gnu-emacs <at> gnu.org:
bug#75415; Package emacs. (Tue, 07 Jan 2025 04:25:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Stefan Monnier <monnier <at> iro.umontreal.ca>:
New bug report received and forwarded. Copy sent to monnier <at> iro.umontreal.ca, bug-gnu-emacs <at> gnu.org. (Tue, 07 Jan 2025 04:25:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; quoted-printable-en/decode-region doesn't preserve end
 markers
Date: Mon, 06 Jan 2025 23:24:15 -0500

Package: Emacs
Version: 31.0.50


In a fresh Emacs try:

       (with-temp-buffer
         (set-buffer-multibyte nil)
         (insert "\300\300")
         (encode-coding-region (point-min) (point) 'utf-8)
         (quoted-printable-encode-region (point-min) (point))
         (insert "!!")
         (buffer-string))

It will likely return "=C0!!=C0" whereas it should return "=C0=C0!!".

Found via a bug in VM: https://gitlab.com/emacs-vm/vm/-/issues/491

The same problem plagues `quoted-printable-decode-region`.

I think we really need to introduce a `replace-region` primitive which
takes care of preserving the position of markers instead of having to teach
ELisp coders the delicate art of combining `insert(-before-markers)` and
`delete` to best preserve markers.


        Stefan
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#75415; Package emacs. (Tue, 07 Jan 2025 19:46:02 GMT) Full text and rfc822 format available.

Message #8 received at 75415 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: 75415 <at> debbugs.gnu.org
Cc: monnier <at> iro.umontreal.ca
Subject: Re: bug#75415: 31.0.50; quoted-printable-en/decode-region doesn't
 preserve end markers
Date: Tue, 7 Jan 2025 13:45:19 -0600

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs <at> gnu.org> writes:

> I think we really need to introduce a `replace-region` primitive which
> takes care of preserving the position of markers instead of having to teach
> ELisp coders the delicate art of combining `insert(-before-markers)` and
> `delete` to best preserve markers.

Sounds good to me, but would this deserve a separate bug report?
This bug report was last modified 159 days ago.

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