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From: Juri Linkov <juri@linkov.net>
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Subject: bug#51210: Customizable other-window-for-scrolling
Date: Tue, 04 Jan 2022 19:37:54 +0200
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In-Reply-To: <f43796a2-6cbb-ea66-6ecd-8979ba0a6f7e@gmx.at> (martin rudalics's
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>>> And shouldn't a window, if specified, override a specified buffer?
>>
>> Its purpose is to override only the part that hard-codes 'next-window'.
>
> How about a variable 'other-window-to-scroll-function' whose default
> value is 'next-window'?

The default behavior is more complex than just 'next-window':

  else if (FUNCTIONP (Vother_window_scroll_default))
    /* Nothing specified; try to get a window from the function.  */
    window = call0 (Vother_window_scroll_default);
  else
    {
      /* Otherwise, look for a neighboring window on the same frame.  */
      window = Fnext_window (selected_window, Qlambda, Qnil);

      if (EQ (window, selected_window))
	/* That didn't get us anywhere; look for a window on another
           visible frame on the current terminal.  */
        window = Fnext_window (window, Qlambda, Qvisible);
    }