28.1; lisp-fill-paragraph result regressed with Emacs 28

Hi,

After updating from Emacs 27 to Emacs 28 via GNU Guix, I noticed the

following change in behavior while attempting to indent a blob of text

in a Guix package definition (Scheme source):

;; Emacs 27

(description "IBus-Anthy is an engine for the input bus \"IBus\"). It

adds the Anthy Japanese language input method to IBus. Because most graphical

applications allow text input via IBus, installing this package will enable

Japanese language input in most graphical applications.")

;; Emacs 28

(description "IBus-Anthy is an engine for the input bus \"IBus\"). It adds the Anthy

Japanese language input method to IBus. Because most graphical applications

allow text input via IBus, installing this package will enable Japanese

language input in most graphical applications.")

I traced it down to commit 9bf367e1848:

Improve filling of Emacs Lisp doc strings

* lisp/emacs-lisp/lisp-mode.el (lisp-fill-paragraph): When filling

a Lisp string, try to avoid filling bits that follow it

(bug#28937).

Simply commenting out the newly added block, evaluating the defun and

running it on my example reverts to the previous correct behavior.

Thanks,

Maxim

---

In GNU Emacs 28.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)

Windowing system distributor 'The X.Org Foundation', version 11.0.12101002

System Description: Guix System

Configured using:

'configure

CONFIG_SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash

SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash

--prefix=/gnu/store/q6x17s6zcgv52sdz3gh69b7g0d9712z8-emacs-28.1

--enable-fast-install --with-modules --with-cairo

--disable-build-details'

Configured features:

ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG

JSON LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER

PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM

GTK3 ZLIB

Important settings:

value of $EMACSLOADPATH: /home/maxim/.guix-profile/share/emacs/site-lisp:/gnu/store/q6x17s6zcgv52sdz3gh69b7g0d9712z8-emacs-28.1/share/emacs/28.1/lisp

value of $LANG: en_US.utf8

value of $XMODIFIERS: @im=ibus

locale-coding-system: utf-8-unix

Major mode: Debbugs

Minor modes in effect:

TeX-PDF-mode: t

global-git-commit-mode: t

magit-auto-revert-mode: t

pyvenv-mode: t

shell-dirtrack-mode: t

yas-global-mode: t

yas-minor-mode: t

emms-mode-line-mode: t

emms-playing-time-display-mode: t

emms-playing-time-mode: t

ws-butler-global-mode: t

ws-butler-mode: t

counsel-mode: t

ivy-mode: t

global-so-long-mode: t

recentf-mode: t

global-company-mode: t

company-mode: t

electric-pair-mode: t

savehist-mode: t

winner-mode: t

display-time-mode: t

global-eldoc-mode: t

show-paren-mode: t

electric-indent-mode: t

mouse-wheel-mode: t

menu-bar-mode: t

file-name-shadow-mode: t

global-font-lock-mode: t

font-lock-mode: t

blink-cursor-mode: t

auto-composition-mode: t

auto-encryption-mode: t

auto-compression-mode: t

buffer-read-only: t

size-indication-mode: t

column-number-mode: t

line-number-mode: t

transient-mark-mode: t

Load-path shadows:

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Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

[...]

I'm not sure the previous behaviour was any more correct. It's now

filling that string as if it, well, is a string, so that if you insert

it somewhere, the lines have similar lengths. The previous behaviour

was to fill "what you see in the buffer", which is wrong in most

contexts.

So I don't know. Anybody have an opinion?

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

I actually don't understand what kind of "Lisp code" is the above

snippet. It doesn't look to me as valid Lisp code. So there's no

criteria for judging the correctness here, it seems.

Eli Zaretskii <eliz@gnu.org> writes:

It's just (foo "... very long multiline string"). I was also confused,

because the string looked very odd -- it has a ) inside the string, but

no (, but that's not really relevant.

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

Lars Ingebrigtsen <larsi@gnus.org> writes:

Oh, hang on -- there definitely is a bug here. Here's a better test case:

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very long line This is a very long line This is a very long line.

And another long line.")

`M-q' in the first line does nothing, and it should. I'll have a look.

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

Lars Ingebrigtsen <larsi@gnus.org> writes:

I've now fixed that, but the question still remains -- should

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very long line This")

be filled as

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very

long line This")

(i.e., fill the string using fill-column, or

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a

very long line This is a very long line This is a very long line This")

(i.e., fill the text as is in the buffer).

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

Hello,

Lars Ingebrigtsen <larsi@gnus.org> writes:

Apologies if my previous example lacked too much context and confused

more than helped. Here's another example, where I just experienced the

problem after revamping the GNU Guix 'font-abattis-cantarrel' package

definition:

This is a Scheme sexp extracted from the (gnu packages fonts) Guile

module. Hitting `lisp-fill-paragraph' (M-q) causes the above

indentation, where the first line of the description extends past the

`fill-column' value.

I hope that helps,

Thanks!

Maxim

Lars Ingebrigtsen <larsi@gnus.org> writes:

The former sounds more useful, IMO. I don't want to mess up my strings

just to have pretty source code; I can make such adjustments manually

when I need to.

Stefan Kangas <stefan@marxist.se> writes:

So the votes are in, and I guess we'll keep the current behaviour in

Emacs 29, and I'm therefore closing this bug report.

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

Lars Ingebrigtsen <larsi@gnus.org> writes:

Or -- perhaps it should be backported to Emacs 28 -- but not right now,

since the release is impending. So I'll keep this open until after

Emacs 28.2, I think.

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no

tags 56197 + pending

quit

On June 30, 2022 5:32:08 AM EDT, Lars Ingebrigtsen <larsi@gnus.org> wrote:

Just to make sure, this means the paragraph filling behavior seen in the examples I shared would be unchanged, and different from that in Emacs 27 and earlier, correct?

To me, the previous behavior was useful; is there a way to configure Emacs to behave that way with Emacs 28?

Thank you!

Maxim

Hi,

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

Yup.

I guess you can set fill-paragraph-function to a function that does what

you want?

--

(domestic pets only, the antidote for overdose, milk.)

bloggy blog: http://lars.ingebrigtsen.no