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According to the documentation of other-window-for-scrolling we should be able to specify the "other window" by setting the variable other-window-scroll-buffer:

other-window-for-scrolling is a built-in function in ‘src/window.c’.

(other-window-for-scrolling)

Return the other window for "other window scroll" commands. If in the minibuffer, ‘minibuffer-scroll-window’ if non-nil specifies the window. Otherwise, if ‘other-window-scroll-buffer’ is non-nil, a window showing that buffer is used, popping the buffer up if necessary. Finally, look for a neighboring window on the selected frame, followed by all visible frames on the current terminal.

However, in reality this seems to be ignored:

(setq other-window-scroll-buffer "*R*")

(other-window-for-scrolling) --> #<window 558 on header.html>

Is this a bug or feature that was removed?

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1 Answer 1

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The doc for other-window-scroll-buffer says:

If this is a live buffer, C-M-v should scroll its window.

(emphasis added). IOW, the value must be a buffer, not the name of a buffer. So try:

(setq other-window-scroll-buffer (get-buffer "*R*"))

get-buffer is a function that returns a buffer, given its name (a string). If no such buffer exists, it returns nil. See its doc string with C-h f get-buffer.

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  • I tried this and did not work for me. Did it work for you?
    – FKG
    Mar 6 at 18:56
  • Yes, it did: do you have a live buffer called *R*? In my case, I set my shell buffer to be the scrolling buffer and other-window-for-scrolling returns it (and makes it visible in a window if it is not visible to begin with) and C-M-v scrolls it (and also makes it visible if necessary).
    – NickD
    Mar 6 at 19:33
  • yes it works. I had the wrong name it is suppose to be:other-window-scroll-buffer not other-window-scrolling-buffer. Thanks
    – FKG
    Mar 6 at 19:44
  • That's my fault: I screwed up the spelling of the variable and instead of cutting and pasting the code, I retyped it getting it wrong in the process. Apologies and thanks. I fixed up the answer.
    – NickD
    Mar 6 at 20:00

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