Package: emacs;
Reported by: Sergio Pastor Pérez <sergio.pastorperez <at> gmail.com>
Date: Fri, 15 Aug 2025 08:33:02 UTC
Severity: minor
Found in version 31.0.50
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From: Sergio Pastor Pérez <sergio.pastorperez <at> gmail.com> To: 79241 <at> debbugs.gnu.org Subject: bug#79241: 31.0.50; `vertical-motion' not respecting goal column when there is an overlay that spans multiple virtual lines Date: Fri, 15 Aug 2025 10:31:29 +0200
The issue is that `vertical-motion' does not seem to respect goal column when moving upwards through an overlay that spans multiple visual lines. I will give a recipe using the latest version of Flymake, since it's an easy way to generate an overlay that spawns multiple visual lines, but I suspect that this issue can be reproduced with any overlay of those characteristics, and is not a particual issue of Flymake. I've tried to debug the line movement code but at some point I reached `vertical-motion', which is a C function, so I didn't debug it further. Invoking: `(vertical-motion '(0.0 . -1))' is enough to see the behavior described. 1) Install Flymake v1.4.1. (I used Elpaca) 2) `(setq flymake-show-diagnostics-at-end-of-line 'fancy)` 3) Go to a buffer where diagnostic will show, I used Eglot for this. 4) Put the cursor a the beginning of the line prior to the overlay generated by Flymake. Notice that when using the `'fancy' setting, the message will span across multiple visual lines. 5) Try to move upwards, towards the diagnostic. We expect the cursor to remain at the beggining of the line but instead, it goes to the end of the line. This behavior does not happen when moving downwards through the diagnostic message. The issue is that `vertical-motion' does not seem to respect goal column when moving upwards through an overlay that spans multiple visual lines. I will give a recipe using the latest version of Flymake, since it's an easy way to generate an overlay that spawns multiple visual lines, but I suspect that this issue can be reproduced with any overlay of those characteristics and is not a particular issue of Flymake. I've tried to debug the line movement code but at some point I reached `vertical-motion' which is a C function so I cannot debug it further. Invoking: `(vertical-motion '(0.0 . -1))' is enough to see the behavior described. 1) Install Flymake v1.4.1. (I used Elpaca) 2) `(setq flymake-show-diagnostics-at-end-of-line 'fancy)` 3) Go to a buffer where diagnostic will show, I used Eglot for this. 4) Put the cursor a the beginning of the line prior to the overlay generated by Flymake. Notice that when using the `'fancy' setting, the message will span across multiple visual lines. 5) Try to move upwords, towards the diagnostic. We expect the cursor to remain at the beginning of the line but instead, it goes to the end of the line. This behavior does not happen when moving downwards through the diagnostic message. In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.43, cairo version 1.18.4) System Description: Guix System Configured using: 'configure CONFIG_SHELL=/gnu/store/nnx8iifrj6jfih4sivivq17cf65aa968-bash-minimal-5.2.37/bin/bash SHELL=/gnu/store/nnx8iifrj6jfih4sivivq17cf65aa968-bash-minimal-5.2.37/bin/bash --prefix=/gnu/store/g1rsgv58jnqpy6q2rnhy7xzqvpjks2f4-emacs-next-pgtk-31.0.50-1.9663c95 --enable-fast-install --with-pgtk --with-cairo --with-modules --with-native-compilation=aot 'CFLAGS=-g -O2 -Wno-error=incompatible-pointer-types' --disable-build-details' Configured features: ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB Important settings: value of $EMACSLOADPATH: /home/pastor/.guix-home/profile/share/emacs/site-lisp:/home/pastor/.guix-home/profile/share/emacs/site-lisp:/run/current-system/profile/share/emacs/site-lisp:/gnu/store/g1rsgv58jnqpy6q2rnhy7xzqvpjks2f4-emacs-next-pgtk-31.0.50-1.9663c95/share/emacs/31.0.50/lisp value of $EMACSNATIVELOADPATH: /home/pastor/.guix-home/profile/lib/emacs/native-site-lisp:/home/pastor/.guix-home/profile/lib/emacs/native-site-lisp value of $LANG: en_US.utf8 locale-coding-system: utf-8-unix Major mode: C++//l Minor modes in effect: eglot--managed-mode: t flymake-mode: t elpaca-use-package-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 abbrev-mode: t Load-path shadows: /home/pastor/.guix-home/profile/share/emacs/site-lisp/guix-emacs hides /run/current-system/profile/share/emacs/site-lisp/guix-emacs /home/pastor/.guix-home/profile/share/emacs/site-lisp/site-start hides /run/current-system/profile/share/emacs/site-lisp/site-start /home/pastor/.emacs.d/elpaca/builds/flymake/flymake hides /gnu/store/g1rsgv58jnqpy6q2rnhy7xzqvpjks2f4-emacs-next-pgtk-31.0.50-1.9663c95/share/emacs/31.0.50/lisp/progmodes/flymake /gnu/store/1i3864529l6ckl45kc80b2y72wfigf6m-emacs-compat-30.0.2.0/share/emacs/site-lisp/compat-30.0.2.0/compat hides /gnu/store/g1rsgv58jnqpy6q2rnhy7xzqvpjks2f4-emacs-next-pgtk-31.0.50-1.9663c95/share/emacs/31.0.50/lisp/emacs-lisp/compat Features: (shadow sort mail-extr info emacsbug lisp-mnt message yank-media puny dired dired-loaddefs rfc822 mml mml-sec epa derived 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 rect cl-extra eglot tree-widget wid-edit external-completion jsonrpc xref flymake thingatpt project diff ert pp ewoc debug backtrace find-func filenotify compile text-property-search pcase imenu cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs misearch multi-isearch flymake-autoloads tramp-archive tramp-gvfs dbus xml tramp trampver tramp-integration tramp-message help-mode tramp-compat xdg shell pcomplete comint ansi-osc ring parse-time iso8601 time-date format-spec ansi-color tramp-loaddefs elpaca-menu-elpa no-littering compat no-littering-autoloads elpaca-menu-melpa elpaca-menu-org elpaca-use-package use-package use-package-ensure use-package-delight use-package-diminish use-package-bind-key bind-key use-package-core elpaca-use-package-autoloads hl-line display-line-numbers elpaca-log elpaca-ui url url-proxy url-privacy url-expand url-methods url-history url-cookie generate-lisp-file url-domsuf url-util url-parse auth-source eieio eieio-core cl-macs password-cache json subr-x map byte-opt gv bytecomp byte-compile url-vars mailcap cl-seq elpaca warnings icons elpaca-process elpaca-autoloads vc-git diff-mode track-changes easy-mmode files-x vc-dispatcher cl-loaddefs cl-lib magit-popup-autoloads geiser-guile-autoloads edit-indirect-autoloads bui-autoloads guix-autoloads rx stgit-autoloads page-break-lines-autoloads dashboard-autoloads memoize-autoloads dash-autoloads s-autoloads f-autoloads all-the-icons-autoloads log4e-autoloads gntp-autoloads alert-autoloads telega-contrib-autoloads rainbow-identifiers-autoloads visual-fill-column-autoloads telega-autoloads consult-autoloads consult-notmuch-autoloads notmuch-indicator-autoloads notmuch-autoloads compat-autoloads jinx-autoloads tablist-autoloads pdf-tools-autoloads company-autoloads geiser-autoloads vterm-git.f76de08-autoloads guix-emacs rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/pgtk-win pgtk-win term/common-win touch-screen pgtk-dnd 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 dynamic-setting system-font-setting font-render-setting cairo gtk pgtk lcms2 multi-tty move-toolbar make-network-process tty-child-frames native-compile emacs) Memory information: ((conses 16 505081 51672) (symbols 48 23934 48) (strings 32 216943 3808) (string-bytes 1 4504841) (vectors 16 35040) (vector-slots 8 447974 25893) (floats 8 76 879) (intervals 56 2253 176) (buffers 992 26))
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