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bug#70038: 29.3.50; Shift up/down in buffer with images on M-x other-win
From: |
Rahguzar |
Subject: |
bug#70038: 29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts |
Date: |
Thu, 28 Mar 2024 18:24:32 +0100 |
User-agent: |
mu4e 1.10.5; emacs 29.3 |
Hi Ramon,
Ramon Diaz-Uriarte <rdiaz02@gmail.com> writes:
> Actually, maybe I can claim those bonus points: this does not depend on
> fonts, though I am triggering it using the package vertico (so maybe this
> example is vertico's fault):
>
>
> Steps:
>
> 1. emacs -Q
> 2. eval this code
>
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> (package-initialize)
> (vertico-mode 1)
>
> (progn
> (defun pin-vscroll-down (win)
> (set-window-vscroll win 200 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 consistently 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*")))
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>
> 3. Do `M-x` (or C-x b). No need to execute anything or switch buffers, just
> have the minibuffer show options.
>
> 4. `C-x o` a few times. You'll see the images move up and down.
>
> I am seeing this in Lucid and GTK builds.
I can also reproduce this now! And vertico mode can be replaced with the
builtin icomplete-vertical-mode. So, the following recipe starting with
emacs -Q works for me:
1) Paste
(let ((height (/ (* 2 (frame-pixel-height)) 15)))
(icomplete-vertical-mode)
(defun pin-vscroll-down (win)
(set-window-vscroll win (/ height 2) t))
(let ((image1 (create-image "~/Downloads/image1.png" nil nil :height height))
(image2 (create-image "~/Downloads/image2.png" nil nil :height height))
(image3 (create-image "~/Downloads/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 consistently 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*")))
into scratch buffer.
2) Evaluate the form above using `C-M-x`.
3) Type M-x t
4) Wait till minibuffer expands to show completions, then type `C-g` to
quit minibuffer.
5) Typing `C-x 0` results in the window with images losing vscroll.
> Best,
>
> R.
Rahguzar