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#79295
[Bug] Artifacts in margin with display-line-numbers-mode (relative)
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Your bug report
#79295: [Bug] Artifacts in margin with display-line-numbers-mode (relative)
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 79295 <at> debbugs.gnu.org.
--
79295: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=79295
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
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> Date: Thu, 28 Aug 2025 20:25:38 +0200
> Cc: Eli Zaretskii <eliz <at> gnu.org>, 79295 <at> debbugs.gnu.org
> From: Marco <marconeumaier <at> gmail.com>
>
> I checked the `alpha-background' option yesterday and it still occured.
>
> Then there was some update also updating MESA to 25.2.1
> (https://docs.mesa3d.org/relnotes/25.2.1.html) and since installing this
> I didn't see these artifacts again.
>
> It's strange cause there was no bug report pointing to this, but maybe
> something changed under the hood. If it comes back I´ll revive the thread.
Thanks, I'm therefore closing this bug.
[Message part 3 (message/rfc822, inline)]
Description:
Hi, when using `display-line-numbers-mode` with relative numbering,
scrolling a buffer sometimes produces
colored horizontal lines or dots in the line-number margin.
Steps to reproduce:
1. Start Emacs with GTK.
2. Enable relative line numbers:
(setq display-line-numbers-type 'relative)
(global-display-line-numbers-mode 1)
3. Scroll the buffer up and down.
Observed behavior:
- Horizontal bars or dots appear in the line-number margin while scrolling.
- Artifacts are colored (green/magenta/white on monitor) but screenshots
show them as dark blue.
- Absolute line numbers render correctly without artifacts.
Environment:
- Emacs version: GNU Emacs 30.2 (build 2, x86_64-pc-linux-gnu, GTK+
Version 3.24.41, cairo version 1.18.0) of 2025-08-15
- GTK version: 3.24.41
- OS: Ubuntu 24.04 with Gnome and Wayland
- Theme: Dracula
Additional observations:
- The issue persists with GDK_DEBUG=nogl and GDK_BACKEND=x11.
- Forcing a solid background for 'line-number' and
'line-number-current-line' mitigates the issue:
(set-face-attribute 'line-number nil :background "#282a36"
:foreground "#6272a4")
(set-face-attribute 'line-number-current-line nil :background
"#282a36" :foreground "#f8f8f2")
- Increasing display-line-numbers-width does not affect the artifacts.
Expected behavior:
Line-number margin should update cleanly without leaving visual artifacts.
This appears to be related specifically to the redraw path of relative
line numbers in `display-line-numbers-mode`.
additional useful info:
In GNU Emacs 30.2 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
cairo version 1.18.0) of 2025-08-15 built on lcy02-amd64-116
Repository revision: 32909ac267415e06a8b18a8b89827d7bbf180b58
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12302006
System Description: Ubuntu 24.04.3 LTS
Configured using:
'configure --prefix=/snap/emacs/current/usr --with-x-toolkit=gtk3
--without-xaw3d --with-modules --with-cairo
--with-native-compilation=aot --without-pgtk --with-xinput2
--with-tree-sitter 'CFLAGS=-isystem
/build/emacs/parts/emacs/install/usr/include -isystem
/build/emacs/parts/emacs/install/usr/include/x86_64-linux-gnu -isystem
/build/emacs/stage/usr/include -O2' 'CPPFLAGS=-isystem
/build/emacs/parts/emacs/install/usr/include -isystem
/build/emacs/parts/emacs/install/usr/include/x86_64-linux-gnu -isystem
/build/emacs/stage/usr/include'
'LDFLAGS=-L/build/emacs/parts/emacs/install/lib
-L/build/emacs/parts/emacs/install/usr/lib
-L/build/emacs/parts/emacs/install/lib/x86_64-linux-gnu
-L/build/emacs/parts/emacs/install/usr/lib/x86_64-linux-gnu
-L/build/emacs/stage/usr/lib''
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 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 XINPUT2 XPM GTK3 ZLIB
Important settings:
value of $LANG: de_DE.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: ELisp/d
Minor modes in effect:
global-company-mode: t
company-mode: t
global-display-line-numbers-mode: t
display-line-numbers-mode: t
override-global-mode: t
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
minibuffer-regexp-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message yank-media puny dired
dired-loaddefs rfc822 mml mml-sec epa epg rfc6068 epg-config gnus-util
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date company-oddmuse company-keywords company-etags
etags fileloop generator xref project company-gtags company-dabbrev-code
company-dabbrev company-files company-clang company-capf company-cmake
company-semantic company-template company-bbdb company pcase sclang
sclang-widgets tree-widget wid-edit sclang-server sclang-help
sclang-help-minor-mode sclang-minor-mode sclang-mode derived sclang-dev
sclang-document sclang-language sclang-interp compile
text-property-search comint ansi-osc ansi-color ring sclang-browser view
sclang-util dracula-theme display-line-numbers use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key easy-mmode use-package-core finder-inf
site-start comp comp-cstr cl-extra help-mode comp-common warnings rx
company-autoloads dracula-theme-autoloads ement-autoloads
lua-mode-autoloads persist-autoloads plz-autoloads svg-lib-autoloads
taxy-magit-section-autoloads taxy-autoloads info magit-section-autoloads
llama-autoloads package browse-url url url-proxy url-privacy url-expand
url-methods url-history url-cookie generate-lisp-file url-domsuf
url-util mailcap url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs icons password-cache json subr-x map byte-opt gv
bytecomp byte-compile url-vars cl-loaddefs cl-lib rmc iso-transl tooltip
cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd touch-screen
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo gtk x-toolkit xinput2 x multi-tty move-toolbar
make-network-process native-compile emacs)
Memory information:
((conses 16 204139 13238) (symbols 48 14132 0) (strings 32 48749 4819)
(string-bytes 1 1433272) (vectors 16 24295)
(vector-slots 8 289139 15606) (floats 8 93 160)
(intervals 56 993 357) (buffers 992 16))
This bug report was last modified 22 days ago.
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1994-97 Ian Jackson.