Package: emacs;
Reported by: Marco <marconeumaier <at> gmail.com>
Date: Sat, 23 Aug 2025 20:59:02 UTC
Severity: normal
Done: Eli Zaretskii <eliz <at> gnu.org>
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Marco <marconeumaier <at> gmail.com> To: bug-gnu-emacs <at> gnu.org Subject: [Bug] Artifacts in margin with display-line-numbers-mode (relative) Date: Sat, 23 Aug 2025 22:18:33 +0200
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))
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