bug#60815: 28.2; Hard-coded M-sff key binding in dired-aux.el

[Eli Zaretskii]

> From: Evgeni Pandurski <epandurski@gmail.com>
> Date: Sat, 14 Jan 2023 18:44:06 +0200
> 
> I have set "(dired-isearch-filenames t)", and have rebound "M-s" to
> something that is not a keymap (other-window). The problem appears
> when I try to "isearch" in a Dired buffer. Then the following code:
> 
> (defun dired-isearch-filenames-end ()
>   "Clean up the Dired file name search after terminating isearch."
>   (define-key isearch-mode-map "\M-sff" nil)
>   (dired-isearch-filenames-mode -1)
>   (remove-hook 'isearch-mode-end-hook #'dired-isearch-filenames-end t)
>   (unless isearch-suspended
>     (kill-local-variable 'dired-isearch-filenames)))
> 
> runs and fails, because it can not bind to "M-sff". It works when I
> change "M-sff" to something that starts with a keymap-binding. This is
> also a problem in Emacs 27.

Please show how you rebound M-s to other-window.