GNU bug report logs - #61102
28.1; with-selected-window/save-window-excursion calls buffer-list-update-hook only once

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Al Haji-Ali <abdo.haji.ali <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.1; with-selected-window/save-window-excursion calls
 buffer-list-update-hook only once
Date: Fri, 27 Jan 2023 18:29:06 +0000

The following code:

--8<---------------cut here---------------start------------->8---

(let ((fn (lambda () (message "Buffer changed: %S" (current-buffer)))))
  (add-hook 'buffer-list-update-hook fn)
  (with-selected-window (minibuffer-window)  
    (save-window-excursion nil) nil)
  (remove-hook 'buffer-list-update-hook fn)
  nil)
  
--8<---------------cut here---------------end--------------->8---

Prints "Buffer changed: #<buffer  *Minibuf-0*>" once, even though the selection should return to the currently selected buffer (which is different from the mini-buffer).

I would expect either that the hook 'buffer-list-update-hook is not called at all, or that it is called twice (one time for every change of the selected buffer).

Best regards,
-- Al

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