Package: emacs;
Reported by: Rahguzar <rahguzar <at> zohomail.eu>
Date: Fri, 23 Jun 2023 14:43:01 UTC
Severity: normal
Found in version 29.0.91
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From: Po Lu <luangruo <at> yahoo.com> To: Rahguzar <rahguzar <at> zohomail.eu> Cc: 64252 <at> debbugs.gnu.org Subject: bug#64252: 29.0.91; pixel-scroll-precision-mode scrolling jumps with large images Date: Sat, 24 Jun 2023 09:29:06 +0800
Rahguzar <rahguzar <at> zohomail.eu> writes: > Dear Emacs developers, > > Starting with `emacs -Q`, paste the following code in scratch buffer > > (let* ((win (display-buffer (get-buffer-create "image-pixel-precision-test"))) > (height (/ (window-text-height win t) 3)) > (file "path-to-some-image-file")) > (select-window win) > (erase-buffer) > (insert-image (create-image file nil nil :height height)) > (insert "\n") > (insert-image (create-image file nil nil :height (* 2 height))) > (insert "\n") > (insert-image (create-image file nil nil :height (* 3 height))) > (insert "\n") > (goto-char 1) > (pixel-scroll-precision-mode) > nil) > > after replacing the binding of variable 'file' with the path to some > existing image. This should selected a window with three images. The > first one take up 1/3 of the window and the second one 2/3 of the > window. The third image is off screen has height equal to the window. > The point is on the first image. Now try to scroll the image using mouse > wheel or track pad. When scrolling starts the point moves to 2nd image > but scrolling works as expected as long some part of the second image is > in view. However as soon as the first image is out of view, any > scrolling results in the second image disappearing and window being > filled with the 3rd image. > > As far as I can tell this is not limited to pixel-scroll-precision mode > and is part of Emacs scrolling behavior, but in > > https://lists.gnu.org/archive/html/help-gnu-emacs/2023-06/msg00199.html > > Eli said that pixel-scroll-precision-mode can handle this scenario but > in my testing it cannot. As far as I can tell in Emacs partial scrolling > works well if there is either 1) a line that is completely visible in > the window or 2) a line that is bigger than the window. However when > both of the these conditions are not satisfied it is only possible to > scroll in line sized jumps. This happens for example when there are two > images which are individually less tall than the window but their > combined height is more than the window. My suspicion is that this is > related to how 'set-window-start' operates and in the scenario outlined > above it moves the window content to make a whole line visible. > > I tried setting 'global-disable-point-adjustment' to see if it helps but > it doesn't. > > > In GNU Emacs 29.0.91 (build 1, x86_64-suse-linux-gnu, GTK+ Version > 3.24.38, cairo version 1.17.8) of 2023-06-20 built on lamb78 > System Description: openSUSE Tumbleweed > > Configured using: > 'configure --host=x86_64-suse-linux-gnu --build=x86_64-suse-linux-gnu > --program-prefix= --disable-dependency-tracking --prefix=/usr > --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin > --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include > --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var > --sharedstatedir=/var/lib --mandir=/usr/share/man > --infodir=/usr/share/info --with-pgtk --with-native-compilation=aot > --with-cairo --with-libotf --with-jpeg --with-tiff --with-gif > --with-png --with-rsvg --with-xft --with-xml2 --with-dbus --with-sound > --with-json --with-mailutils --with-gnutls --with-tree-sitter > --enable-locallisppath=/usr/share/emacs/29.0.91/site-lisp:/usr/share/emacs/site-lisp > 'CFLAGS=-O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 > -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables > -fstack-clash-protection -Werror=return-type -flto=auto' > LDFLAGS=-Wl,-O2' > > Configured features: > CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON > LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY > PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF > TOOLKIT_SCROLL_BARS TREE_SITTER XIM GTK3 ZLIB > > Important settings: > value of $LANG: en_US.UTF-8 > locale-coding-system: utf-8-unix > > Major mode: mu4e:main > > Minor modes in effect: > recentf-mode: t > save-place-mode: t > global-so-long-mode: t > global-evil-surround-mode: t > evil-surround-mode: t > eros-mode: t > projectile-mode: t > which-key-mode: t > savehist-mode: t > better-jumper-mode: t > better-jumper-local-mode: t > global-company-mode: t > company-mode: t > vertico-mode: t > all-the-icons-completion-mode: t > marginalia-mode: t > evil-goggles-mode: t > evil-escape-mode: t > evil-snipe-override-mode: t > evil-snipe-mode: t > gcmh-mode: t > winner-mode: t > smartparens-global-mode: t > ws-butler-global-mode: t > undo-fu-session-global-mode: t > undo-fu-mode: t > satchel-mode: t > mu4e-search-minor-mode: t > global-hl-line-mode: t > hl-line-mode: t > mu4e-update-minor-mode: t > mu4e-context-minor-mode: t > dirvish-override-dired-mode: t > server-mode: t > repeat-mode: t > evil-mode: t > evil-local-mode: t > windmove-mode: t > +popup-mode: t > +modeline-global-mode: t > +modeline-mode: t > override-global-mode: t > general-override-mode: t > global-eldoc-mode: t > show-paren-mode: t > electric-indent-mode: t > mouse-wheel-mode: t > file-name-shadow-mode: t > global-font-lock-mode: t > font-lock-mode: t > window-divider-mode: t > buffer-read-only: t > size-indication-mode: t > line-number-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/azeem/.emacs.d/.local/straight/build-29.0.91/emacsql/emacsql-sqlite-builtin hides /home/azeem/.emacs.d/.local/straight/build-29.0.91/emacsql-sqlite-builtin/emacsql-sqlite-builtin > /home/azeem/.emacs.d/.local/straight/build-29.0.91/citar-embark/citar-embark hides /home/azeem/.emacs.d/.local/straight/build-29.0.91/citar/citar-embark > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-view hides /usr/share/emacs/site-lisp/mu4e/mu4e-view > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-search hides /usr/share/emacs/site-lisp/mu4e/mu4e-search > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-query-items hides /usr/share/emacs/site-lisp/mu4e/mu4e-query-items > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-org hides /usr/share/emacs/site-lisp/mu4e/mu4e-org > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-notification hides /usr/share/emacs/site-lisp/mu4e/mu4e-notification > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-icalendar hides /usr/share/emacs/site-lisp/mu4e/mu4e-icalendar > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-config hides /usr/share/emacs/site-lisp/mu4e/mu4e-config > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-window hides /usr/share/emacs/site-lisp/mu4e/mu4e-window > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-modeline hides /usr/share/emacs/site-lisp/mu4e/mu4e-modeline > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e hides /usr/share/emacs/site-lisp/mu4e/mu4e > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-vars hides /usr/share/emacs/site-lisp/mu4e/mu4e-vars > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-update hides /usr/share/emacs/site-lisp/mu4e/mu4e-update > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-server hides /usr/share/emacs/site-lisp/mu4e/mu4e-server > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-obsolete hides /usr/share/emacs/site-lisp/mu4e/mu4e-obsolete > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-message hides /usr/share/emacs/site-lisp/mu4e/mu4e-message > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-mark hides /usr/share/emacs/site-lisp/mu4e/mu4e-mark > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-main hides /usr/share/emacs/site-lisp/mu4e/mu4e-main > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-helpers hides /usr/share/emacs/site-lisp/mu4e/mu4e-helpers > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-headers hides /usr/share/emacs/site-lisp/mu4e/mu4e-headers > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-folders hides /usr/share/emacs/site-lisp/mu4e/mu4e-folders > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-draft hides /usr/share/emacs/site-lisp/mu4e/mu4e-draft > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-contrib hides /usr/share/emacs/site-lisp/mu4e/mu4e-contrib > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-context hides /usr/share/emacs/site-lisp/mu4e/mu4e-context > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-compose hides /usr/share/emacs/site-lisp/mu4e/mu4e-compose > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-bookmarks hides /usr/share/emacs/site-lisp/mu4e/mu4e-bookmarks > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-actions hides /usr/share/emacs/site-lisp/mu4e/mu4e-actions > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-speedbar hides /usr/share/emacs/site-lisp/mu4e/mu4e-speedbar > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-lists hides /usr/share/emacs/site-lisp/mu4e/mu4e-lists > /home/azeem/.emacs.d/.local/straight/build-29.0.91/mu4e/mu4e-contacts hides /usr/share/emacs/site-lisp/mu4e/mu4e-contacts > > Features: > (shadow emacsbug evil-collection-xref xref company-ispell > company-yasnippet company-dabbrev delsel jka-compr whitespace > adaptive-wrap face-remap recentf tree-widget saveplace > evil-collection-so-long so-long evil-collection-helpful helpful cc-langs > cc-vars cc-defs evil-collection-imenu imenu trace evil-collection-edebug > edebug evil-collection-debug debug backtrace info-look > evil-collection-info info f f-shortdoc help-fns radix-tree > evil-collection-elisp-refs elisp-refs s vertico-directory hide-mode-line > org-crypt evil-embrace evil-surround eros highlight-quoted > rainbow-delimiters highlight-numbers parent-mode hl-todo > evil-collection-elisp-mode elisp-mode org-eldoc embrace expand-region > text-mode-expansions the-org-mode-expansions er-basic-expansions > expand-region-core expand-region-custom cdlatex texmathp toc-org > evil-org display-line-numbers jit-spell ispell org-indent org-element > org-persist xdg org-id org-refile avl-tree generator ol-bibtex > gnus-async gnus-bcklg gnus-ml disp-table auto-minor-mode link-hint ffap > goto-addr avy sort gnus-cite smiley shr-color mm-archive mail-extr > textsec uni-scripts idna-mapping ucs-normalize uni-confusable > textsec-check qp projectile lisp-mnt evil-collection-grep grep nndraft > nnmh nnfolder cursor-sensor vertico-repeat epa-file network-stream nsm > gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg nntp > gnus-cache evil-collection-which-key which-key savehist better-jumper > company-capf company evil-collection-vertico vertico orderless > all-the-icons-completion marginalia compat evil-goggles pulse color > evil-easymotion evil-escape evil-snipe autorevert filenotify gcmh winner > smartparens-config smartparens-text smartparens dash ws-butler > undo-fu-session undo-fu satchel ibuf-ext evil-collection-ibuffer ibuffer > ibuffer-loaddefs desktop frameset mu4e mu4e-org evil-collection-org > smartparens-org org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro > org-src ob-comint org-pcomplete pcomplete org-list org-footnote > org-faces org-entities noutline outline ob-emacs-lisp ob-core ob-eval > org-cycle org-table ol org-fold org-fold-core org-keys oc-natbib oc-csl > bibtex oc-biblatex oc org-loaddefs find-func org-version org-compat > org-macs mu4e-notification notifications mu4e-main mu4e-view gnus-art > mm-uu mml2015 mm-view mml-smime smime gnutls dig gnus-sum gnus-group > gnus-undo gnus-start gnus-dbus dbus gnus-cloud nnimap nnmail mail-source > utf7 nnoo parse-time iso8601 gnus-spec gnus-int gnus-range gnus-win > evil-collection-gnus gnus nnheader range evil-collection-calendar > cal-menu calendar cal-loaddefs mu4e-headers mu4e-compose mu4e-draft > mu4e-actions smtpmail mu4e-search mu4e-lists mu4e-bookmarks mu4e-mark > mu4e-message shr pixel-fill kinsoku url-file svg xml dom browse-url url > url-proxy url-privacy url-expand url-methods url-history url-cookie > generate-lisp-file url-domsuf url-util url-parse auth-source json map > url-vars flow-fill mule-util hl-line mu4e-contacts mu4e-update > mu4e-folders mu4e-context mu4e-query-items mu4e-server mu4e-modeline > mu4e-vars mu4e-helpers mu4e-config mu4e-window evil-collection-bookmark > bookmark ido message sendmail mailcap yank-media puny dirvish transient > format-spec eieio eieio-core evil-collection-dired dired dired-loaddefs > rfc822 mml mml-sec password-cache evil-collection-epa epa epg rfc6068 > epg-config gnus-util time-date mm-decode mm-bodies mm-encode mail-parse > rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev > mail-utils gmm-utils mailheader mu4e-obsolete server dtrt-indent > ef-spring-theme ef-themes repeat midnight evil-collection-flymake > flymake-proc flymake project evil-collection-compile > evil-collection-custom cus-edit cus-load wid-edit evil-collection-comint > evil-collection annalist compile text-property-search comint ansi-osc > ansi-color html2text let-alist ibuf-macs evil evil-integration evil-maps > evil-commands reveal evil-jumps evil-command-window evil-search > evil-types evil-macros evil-repeat evil-states evil-core byte-opt advice > evil-common windmove calc calc-loaddefs calc-macs thingatpt rect > evil-digraphs evil-vars ring all-the-icons all-the-icons-faces > data-material data-weathericons data-octicons data-fileicons > data-faicons data-alltheicons derived edmacro kmacro > use-package-bind-key bind-key comp comp-cstr warnings icons rx > doom-editor doom-projects doom-ui easy-mmode doom-keybinds pp cl-extra > help-mode use-package-core bytecomp byte-compile general tex-site > doom-start doom-modules cl-seq doom doom-lib cl-macs cl-loaddefs cl-lib > pcase gv jansson dynamic-modules subr-x rmc iso-transl tooltip cconv > eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type mwheel > term/pgtk-win pgtk-win term/common-win 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 > multi-tty make-network-process native-compile emacs) > > Memory information: > ((conses 16 1112649 163180) > (symbols 48 47706 27) > (strings 32 197743 25767) > (string-bytes 1 7031793) > (vectors 16 120738) > (vector-slots 8 2076120 174082) > (floats 8 1459 2514) > (intervals 56 75919 1751) > (buffers 984 23)) If an image is larger than the window, pixel-scroll-precision-mode is unable to determine a position of point that will not cause redisplay to recenter the window after scrolling takes place. There is definitely a solution to this problem, but I haven't found it yet. Patches welcome. Thanks.
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