bug#70038: 29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts

[Ramon Diaz-Uriarte <rdiaz02@gmail.com>]

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With some fonts, changing focus (M-x other-window) from a buffer with images, makes the content in the buffer with images to shift up and down.

I am seeing this in Debian, with both the GTK and Lucid builds, under X11.

The code below reproduces the problem. This problem has been identified while debugging a change on focus issue with pdf-tools (https://github.com/vedang/pdf-tools/pull/224#issuecomment-2014151358 and ff.)


How to reproduce

- Copy the images to /tmp  (or place there three reasonably sized images, named image1.png, image2.png, image3.png)

- emacs -Q

- eval the following code

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Place images in /tmp
(progn
  (defun pin-vscroll-down (win)
    (set-window-vscroll win 200 t))
  ;; Any of the following leads to the bug
  (set-frame-font "JuliaMono" nil t)
  ;; (set-frame-font "DM Mono" nil t)
  ;; (set-frame-font "Intel One Mono" nil t)
  (let* ((height (/ (* 2 (frame-pixel-height)) 15))
         (image1 (create-image "/tmp/image1.png" nil nil :height height))
         (image2 (create-image "/tmp/image2.png" nil nil :height height))
         (image3 (create-image "/tmp/image3.png" nil nil :height height)))
    (with-current-buffer (get-buffer-create "*image-scroll-test*")
      (insert " \n \n \n \n \n \n")
      (put-image image1 1)
      (put-image image2 5)
      (put-image image3 9)
      ;; With larger image sizes (goto-char 3)
      ;; also triggers the problem.
      (goto-char 11)
      (add-hook 'pre-redisplay-functions #'pin-vscroll-down nil t))
    (split-window-right)
    (other-window 1)
    (switch-to-buffer "*image-scroll-test*")))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

- M-x other-window

- Notice how the images on the buffer on the right move up and down.



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In GNU Emacs 29.3.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.18.0) of 2024-03-26 built on Phelsuma
Repository revision: 38faacf353fb4c8efb027019a4619a386edfe62c
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --disable-silent-rules --with-native-compilation=aot
 --with-json --with-xwidgets --without-xaw3d --with-x-toolkit=gtk3
 --with-xinput2 --with-tree-sitter
 --prefix=/home/ramon/Sources/emacs29-bin 'CFLAGS=-g -O2 -mtune=native
 -march=native' 'CC=ccache gcc''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON 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 XWIDGETS GTK3 ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  dogears-mode: t
  global-jinx-mode: t
  jinx-mode: t
  company-quickhelp-mode: t
  company-quickhelp-local-mode: t
  hideshowvis-minor-mode: t
  rainbow-delimiters-mode: t
  outli-mode: t
  outline-minor-mode: t
  symbol-overlay-mode: t
  display-fill-column-indicator-mode: t
  hl-line-mode: t
  display-line-numbers-mode: t
  company-tng-mode: t
  global-company-mode: t
  company-mode: t
  pixel-scroll-precision-mode: t
  which-function-mode: t
  recentf-mode: t
  vertico-indexed-mode: t
  vertico-prescient-mode: t
  prescient-persist-mode: t
  vertico-multiform-mode: t
  vertico-mode: t
  marginalia-mode: t
  helm-ff-icon-mode: t
  shell-dirtrack-mode: t
  helm-autoresize-mode: 1
  async-bytecomp-package-mode: t
  pulsar-global-mode: t
  pulsar-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  global-aggressive-indent-mode: t
  aggressive-indent-mode: t
  shackle-mode: t
  winner-mode: t
  global-anzu-mode: t
  anzu-mode: t
  savehist-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  electric-pair-mode: t
  which-key-mode: t
  minibuffer-depth-indicate-mode: t
  global-auto-revert-mode: t
  override-global-mode: t
  gcmh-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-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
  hs-minor-mode: t

Load-path shadows:
/home/ramon/.emacs.d/elpa/ef-themes-1.5.1/theme-loaddefs hides /home/ramon/.emacs.d/elpa/modus-themes-20240303.1023/theme-loaddefs
/home/ramon/.emacs.d/elpa/emacsql-sqlite-builtin-20240119.2314/emacsql-sqlite-builtin hides /home/ramon/.emacs.d/elpa/emacsql-20240124.1601/emacsql-sqlite-builtin
/home/ramon/.emacs.d/elpa/transient-20240226.2332/transient hides /home/ramon/Sources/emacs29-bin/share/emacs/29.3.50/lisp/transient
/home/ramon/.emacs.d/elpa/ef-themes-1.5.1/theme-loaddefs hides /home/ramon/Sources/emacs29-bin/share/emacs/29.3.50/lisp/theme-loaddefs
/home/ramon/.emacs.d/elpa/eldoc-1.15.0/eldoc hides /home/ramon/Sources/emacs29-bin/share/emacs/29.3.50/lisp/emacs-lisp/eldoc

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Memory information:
((conses 16 484796 318366)
 (symbols 48 30627 9)
 (strings 32 135401 49483)
 (string-bytes 1 4269554)
 (vectors 16 51708)
 (vector-slots 8 1089854 540164)
 (floats 8 1329 1287)
 (intervals 56 825 472)
 (buffers 984 12))


-- 
Ramon Diaz-Uriarte
Department of Biochemistry, Lab B-31
Facultad de Medicina 
Universidad Autónoma de Madrid 
Arzobispo Morcillo, 4
28029 Madrid
Spain

Phone: +34-91-497-2412

Email: rdiaz02@gmail.com
       r.diaz@uam.es
       ramon.diaz@iib.uam.es

https://ligarto.org/rdiaz