GNU bug report logs - #79317
31.0.50; Garbled text in corner case

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

From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Garbled text in corner case
Date: Tue, 26 Aug 2025 17:03:26 +0900

In current emacs, in corner case, the displayed text is garbled.
Simplified reproducible code is the following,

(with-temp-buffer
  (dotimes (_ 3)
    (insert "😀😀😀\n"))
  (add-to-invisibility-spec '(gnus-sum . t))
  (goto-char (point-min))
  (let ((starteol (line-end-position)))
    (forward-line 2)
  (search-backward "\n")
  (let ((ol (make-overlay starteol (point) nil t nil)))
    (overlay-put ol 'invisible 'gnus-sum)
    ;; here
    )))

At ";; here" position, first line uses proper font and text, but send
line is garbled text.  And if comment out the
`add-to-invisibility-spec', no garbled text.

Thanks.


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.50, cairo version 1.18.4) of 2025-08-26 built on devron
Repository revision: 21b072c6074466f3ec7d2489b82e21d8b0cae265
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: Debian GNU/Linux forky/sid

Configured using:
 'configure --with-x-toolkit=gtk3 --without-xim --with-imagemagick
 --with-wide-int --with-native-compilation=aot'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBSELINUX 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
XINERAMA XINPUT2 XPM XRANDR GTK3 ZLIB

Important settings:
  value of $LANG: ja_JP.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
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  flycheck-pos-tip-mode: t
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  indent-tabs-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 1680865 1768522) (symbols 48 30083 37)
 (strings 32 1918695 60593) (string-bytes 1 78848833)
 (vectors 16 545198) (vector-slots 8 4653235 365494)
 (floats 8 148617 128624) (intervals 56 17321 2647) (buffers 1064 33))

-- 
OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>

Message #8 received at 79317 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
Cc: 79317 <at> debbugs.gnu.org
Subject: Re: bug#79317: 31.0.50; Garbled text in corner case
Date: Tue, 26 Aug 2025 16:27:02 +0300

> From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
> Date: Tue, 26 Aug 2025 17:03:26 +0900
> 
> 
> In current emacs, in corner case, the displayed text is garbled.
> Simplified reproducible code is the following,
> 
> (with-temp-buffer
>   (dotimes (_ 3)
>     (insert "😀😀😀\n"))
>   (add-to-invisibility-spec '(gnus-sum . t))
>   (goto-char (point-min))
>   (let ((starteol (line-end-position)))
>     (forward-line 2)
>   (search-backward "\n")
>   (let ((ol (make-overlay starteol (point) nil t nil)))
>     (overlay-put ol 'invisible 'gnus-sum)
>     ;; here
>     )))
> 
> At ";; here" position, first line uses proper font and text, but send
> line is garbled text.  And if comment out the
> `add-to-invisibility-spec', no garbled text.

Thanks for a simple and concise test case.  This should be fixed now
on the master branch.

Message #11 received at 79317 <at> debbugs.gnu.org (full text, mbox):

From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 79317 <at> debbugs.gnu.org
Subject: Re: bug#79317: 31.0.50; Garbled text in corner case
Date: Tue, 26 Aug 2025 23:46:57 +0900

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
>> Date: Tue, 26 Aug 2025 17:03:26 +0900
>> 
>> 
>> In current emacs, in corner case, the displayed text is garbled.
>> Simplified reproducible code is the following,
>> 
>> (with-temp-buffer
>>   (dotimes (_ 3)
>>     (insert "😀😀😀\n"))
>>   (add-to-invisibility-spec '(gnus-sum . t))
>>   (goto-char (point-min))
>>   (let ((starteol (line-end-position)))
>>     (forward-line 2)
>>   (search-backward "\n")
>>   (let ((ol (make-overlay starteol (point) nil t nil)))
>>     (overlay-put ol 'invisible 'gnus-sum)
>>     ;; here
>>     )))
>> 
>> At ";; here" position, first line uses proper font and text, but send
>> line is garbled text.  And if comment out the
>> `add-to-invisibility-spec', no garbled text.
>
> Thanks for a simple and concise test case.  This should be fixed now
> on the master branch.

Thanks. Looks like working for me.
-- 
OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>

Message #14 received at 79317 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
Cc: 79317 <at> debbugs.gnu.org
Subject: Re: bug#79317: 31.0.50; Garbled text in corner case
Date: Tue, 26 Aug 2025 18:50:41 +0300

> From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
> Cc: 79317 <at> debbugs.gnu.org
> Date: Tue, 26 Aug 2025 23:46:57 +0900
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>
> >> Date: Tue, 26 Aug 2025 17:03:26 +0900
> >> 
> >> 
> >> In current emacs, in corner case, the displayed text is garbled.
> >> Simplified reproducible code is the following,
> >> 
> >> (with-temp-buffer
> >>   (dotimes (_ 3)
> >>     (insert "😀😀😀\n"))
> >>   (add-to-invisibility-spec '(gnus-sum . t))
> >>   (goto-char (point-min))
> >>   (let ((starteol (line-end-position)))
> >>     (forward-line 2)
> >>   (search-backward "\n")
> >>   (let ((ol (make-overlay starteol (point) nil t nil)))
> >>     (overlay-put ol 'invisible 'gnus-sum)
> >>     ;; here
> >>     )))
> >> 
> >> At ";; here" position, first line uses proper font and text, but send
> >> line is garbled text.  And if comment out the
> >> `add-to-invisibility-spec', no garbled text.
> >
> > Thanks for a simple and concise test case.  This should be fixed now
> > on the master branch.
> 
> Thanks. Looks like working for me.

Thanks for testing the fix.

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