bug#68081: 30.0.50; derived-mode and display-buffer-alist

[Eli Zaretskii]

> From: German Pacenza <germanp82@hotmail.com>
> Date: Thu, 28 Dec 2023 10:26:37 -0300
> 
> display-buffer-alist rules that use derived-mode or major-mode are
> ignored on first use.
> 
> emacs -Q:
> 
> (setq display-buffer-alist '(((derived-mode . Info-mode)
>                               (display-buffer-in-side-window))))
> "C-h i"
> The info buffer takes the whole window
> "q"
> "C-h i"
> The info buffer opens in side window as expected
> 
> Info and Compilation modes are affected, but Help and Man work as expected

Martin, any comments or suggestions?