bug#68486: 29.1; Confusing window layout changes in image-dired

[joakim@verona.se]

Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

> Hi,
>
> Could you try this patch?

After some failures trying the patch in my running emacs session, I
tried with emacs -q, and now it worked, big improvement!



> -- 
> Manuel Giraud
>
> From b979865cf8cf2fa8ec73ac8bc6cfee32f6de68fc Mon Sep 17 00:00:00 2001
> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Date: Tue, 16 Jan 2024 10:47:45 +0100
> Subject: [PATCH] Refill 'image-dired-display-image-buffer'
>
> Bug#68486
>
> * lisp/image/image-dired.el (image-dired-display-image): Refill
> 'image-dired-display-image-buffer' instead of killing it, open a new
> file and then renaming it.
> ---
>  lisp/image/image-dired.el | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/lisp/image/image-dired.el b/lisp/image/image-dired.el
> index 9eb68e240fe..b08aa129b98 100644
> --- a/lisp/image/image-dired.el
> +++ b/lisp/image/image-dired.el
> @@ -1260,18 +1260,18 @@ image-dired-display-image
>    (setq file (expand-file-name file))
>    (when (not (file-exists-p file))
>      (error "No such file: %s" file))
> -  (let ((buf (get-buffer image-dired-display-image-buffer))
> +  (let ((buf (get-buffer-create image-dired-display-image-buffer))
>          (cur-win (selected-window)))
> -    (when buf
> -      (kill-buffer buf))
> -    (when-let ((buf (find-file-noselect file nil t)))
> -      (pop-to-buffer buf)
> -      (rename-buffer image-dired-display-image-buffer)
> -      (if (string-match (image-file-name-regexp) file)
> -          (image-dired-image-mode)
> -        ;; Support visiting PDF files.
> -        (normal-mode))
> -      (select-window cur-win))))
> +    (with-current-buffer buf
> +      (let ((inhibit-read-only t))
> +        (erase-buffer)
> +        (insert-file-contents file)
> +        (if (string-match (image-file-name-regexp) file)
> +            (image-dired-image-mode)
> +          ;; Support visiting PDF files.
> +          (normal-mode))))
> +    (when buf (pop-to-buffer buf))
> +    (select-window cur-win)))
>  
>  (defun image-dired-display-this (&optional arg)
>    "Display current thumbnail's original image in display buffer.
-- 
Joakim Verona
joakim@verona.se