bug#72150: 'fill-region' works incorrectly

bug#72150: 'fill-region' works incorrectly

[the_wurfkreuz via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 28343 bytes --]

If i set '(setq-default fill-column 79)' and then try to format the text below with the 'fill-region' command:

"If you mount a filesystem over a directory that already contains files, those files become hidden and are not counted in the disk usage of the mount point. However, the space they occupy is still used on the underlying filesystem."

Then instead of getting this formatting:

If you mount a filesystem over a directory that already contains files, those
files become hidden and are not counted in the disk usage of the mount point.
However, the space they occupy is still used on the underlying filesystem.

I get this:

If you mount a filesystem over a directory that already contains files, those
files become hidden and are not counted in the disk usage of the mount
point. However, the space they occupy is still used on the underlying
filesystem.

I think it shouldn't work this way, because if i try to correct the
formatting manually and then apply fill-region of my edit, it wont
change it in any way. Which should mean that the command actually agrees
on how i manually formatted the text.

Reproduction:
1. emacs -Q
2. M-: (setq-default fill-column 79)
3. Paste "If you mount a filesystem over a directory that already contains files, those files become hidden and are not counted in the disk usage of the mount point. However, the space they occupy is still used on the underlying filesystem." into the scratch buffer (without double quotes).
4. C-Space, C-a to highlight the pasted text.
5. Execute 'fill-region'.

Then you can try to manually "fix" the formatting like i did, and retry 'fill-region' again and it wont change anything with the manually formatted text.

In GNU Emacs 30.0.60 (build 2, x86_64-pc-linux-gnu, GTK+ Version
3.24.43, cairo version 1.18.0) of 2024-07-16 built on archlinux
Repository revision: e3bba63ecb9302d5a30c7ec55fa564aa9aba2b11
Repository branch: emacs-30
Windowing system distributor 'The X.Org Foundation', version 11.0.12401001
System Description: Arch Linux

Configured using:
'configure --with-native-compilation=aot --with-tree-sitter --with-gif
--with-png --with-jpeg --with-rsvg --with-tiff --with-imagemagick
--with-x-toolkit=gtk3 --with-xwidgets
CPPFLAGS=-I/opt/homebrew/opt/jpeg/include
LDFLAGS=-L/opt/homebrew/opt/jpeg/lib'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2
XPM XWIDGETS GTK3 ZLIB

Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
windmove-mode: t
org-indent-mode: t
org-bullets-mode: t
pyvenv-mode: t
shackle-mode: t
popper-echo-mode: t
popper-mode: t
eshell-syntax-highlighting-global-mode: t
all-the-icons-ivy-rich-mode: t
ivy-rich-mode: t
counsel-mode: t
ivy-mode: t
override-global-mode: t
global-fish-completion-mode: t
fish-completion-mode: t
corfu-popupinfo-mode: t
corfu-history-mode: t
corfu-echo-mode: t
global-corfu-mode: t
corfu-mode: t
yas-global-mode: t
yas-minor-mode: t
dired-async-mode: t
general-override-mode: t
global-treesit-auto-mode: t
global-evil-collection-unimpaired-mode: t
evil-collection-unimpaired-mode: t
evil-org-mode: t
global-evil-surround-mode: t
evil-surround-mode: t
evil-mode: t
evil-local-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
global-auto-revert-mode: t
pixel-scroll-precision-mode: t
save-place-mode: t
savehist-mode: t
electric-pair-mode: t
global-display-line-numbers-mode: t
display-line-numbers-mode: t
straight-use-package-mode: t
straight-package-neutering-mode: t
tooltip-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
prettify-symbols-mode: t
tab-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
minibuffer-regexp-mode: t
line-number-mode: t
auto-fill-function: #[128 \304\300\301#\207 [yas--auto-fill org-auto-fill-function :around nil apply] 5 advice]
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t

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/home/wurfkreuz/.emacs.d/straight/build/org/ob-R hides /home/wurfkreuz/.source/emacs/lisp/org/ob-R
/home/wurfkreuz/.emacs.d/straight/build/org/ob-comint hides /home/wurfkreuz/.source/emacs/lisp/org/ob-comint
/home/wurfkreuz/.emacs.d/straight/build/org/ob-css hides /home/wurfkreuz/.source/emacs/lisp/org/ob-css
/home/wurfkreuz/.emacs.d/straight/build/org/ob-clojure hides /home/wurfkreuz/.source/emacs/lisp/org/ob-clojure
/home/wurfkreuz/.emacs.d/straight/build/org/ob-calc hides /home/wurfkreuz/.source/emacs/lisp/org/ob-calc
/home/wurfkreuz/.emacs.d/straight/build/org/ob-awk hides /home/wurfkreuz/.source/emacs/lisp/org/ob-awk
/home/wurfkreuz/.emacs.d/straight/build/org/org-element hides /home/wurfkreuz/.source/emacs/lisp/org/org-element
/home/wurfkreuz/.emacs.d/straight/build/org/ox hides /home/wurfkreuz/.source/emacs/lisp/org/ox
/home/wurfkreuz/.emacs.d/straight/build/org/oc hides /home/wurfkreuz/.source/emacs/lisp/org/oc
/home/wurfkreuz/.emacs.d/straight/build/org/ox-texinfo hides /home/wurfkreuz/.source/emacs/lisp/org/ox-texinfo
/home/wurfkreuz/.emacs.d/straight/build/org/ol hides /home/wurfkreuz/.source/emacs/lisp/org/ol
/home/wurfkreuz/.emacs.d/straight/build/org/org-macro hides /home/wurfkreuz/.source/emacs/lisp/org/org-macro
/home/wurfkreuz/.emacs.d/straight/build/org/org-version hides /home/wurfkreuz/.source/emacs/lisp/org/org-version
/home/wurfkreuz/.emacs.d/straight/build/map/map hides /home/wurfkreuz/.source/emacs/lisp/emacs-lisp/map
/home/wurfkreuz/.emacs.d/straight/build/compat/compat hides /home/wurfkreuz/.source/emacs/lisp/emacs-lisp/compat
/home/wurfkreuz/.emacs.d/straight/build/seq/seq hides /home/wurfkreuz/.source/emacs/lisp/emacs-lisp/seq
/home/wurfkreuz/.emacs.d/straight/build/eldoc/eldoc hides /home/wurfkreuz/.source/emacs/lisp/emacs-lisp/eldoc

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Memory information:
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(string-bytes 1 8600845) (vectors 16 113226) (vector-slots 8 2056448 177589)
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bug#72150: 'fill-region' works incorrectly

[Stephen Berman via Bug reports for GNU Emacs, the Swiss army knife of text editors]

On Wed, 17 Jul 2024 07:13:29 +0000 the_wurfkreuz via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> wrote:

> If i set '(setq-default fill-column 79)' and then try to format the text below
> with the 'fill-region' command:
>
> "If you mount a filesystem over a directory that already contains files, those
> files become hidden and are not counted in the disk usage of the mount
> point. However, the space they occupy is still used on the underlying
> filesystem."
>
> Then instead of getting this formatting:
>
> If you mount a filesystem over a directory that already contains files, those
> files become hidden and are not counted in the disk usage of the mount point.
> However, the space they occupy is still used on the underlying filesystem.
>
> I get this:
>
> If you mount a filesystem over a directory that already contains files, those
> files become hidden and are not counted in the disk usage of the mount
> point. However, the space they occupy is still used on the underlying
> filesystem.

This is because the user option `sentence-end-double-space' has the
default value t.  Change it to nil to make fill-region give the result
you expect.

Steve Berman

bug#72150: 'fill-region' works incorrectly

[Eli Zaretskii]

tags 72150 notabug
close 72150
thanks

> Cc: the_wurfkreuz@proton.me
> Date: Wed, 17 Jul 2024 10:03:13 +0200
> From:  Stephen Berman via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> On Wed, 17 Jul 2024 07:13:29 +0000 the_wurfkreuz via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> wrote:
> 
> > If i set '(setq-default fill-column 79)' and then try to format the text below
> > with the 'fill-region' command:
> >
> > "If you mount a filesystem over a directory that already contains files, those
> > files become hidden and are not counted in the disk usage of the mount
> > point. However, the space they occupy is still used on the underlying
> > filesystem."
> >
> > Then instead of getting this formatting:
> >
> > If you mount a filesystem over a directory that already contains files, those
> > files become hidden and are not counted in the disk usage of the mount point.
> > However, the space they occupy is still used on the underlying filesystem.
> >
> > I get this:
> >
> > If you mount a filesystem over a directory that already contains files, those
> > files become hidden and are not counted in the disk usage of the mount
> > point. However, the space they occupy is still used on the underlying
> > filesystem.
> 
> This is because the user option `sentence-end-double-space' has the
> default value t.  Change it to nil to make fill-region give the result
> you expect.

No further comments, so I'm closing this non-bug.