bug#64451: 30.0.50; split-root-window-right ignores side windows

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Mon, 03 Jul 2023 19:38:01 -0400
> 
> 
> (display-buffer "*scratch*" '(display-buffer-in-side-window . ((side . 
> right))))
> M-x split-root-window-right
> 
> I would expect the new window to be to the left of the side window (I
> know this is counter-intuitive to splititng the root window, but it's
> also intuitive given the nature of side windows...)
> 
> I don't know if this is intentional. I also don't know if it's a
> regression as it's not behavior I remember seeing until fairly recently.

Martin, any comments?

Thanks.