Re: emacs-29 bdb0bc2b4e4: Fix tex-mode display-buffer issues

[Eli Zaretskii <eliz@gnu.org>]

> From: Michael Albinus <michael.albinus@gmx.de>
> Cc: Eli Zaretskii <eliz@gnu.org>
> Date: Mon, 12 Jun 2023 14:21:07 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> Hi Eli,
> 
> > branch: emacs-29
> > commit bdb0bc2b4e44a7d40369e10e3de825d58fe46825
> > Author: Eli Zaretskii <eliz@gnu.org>
> > Commit: Eli Zaretskii <eliz@gnu.org>
> >
> >     Fix tex-mode display-buffer issues
> >     
> >     * lisp/window.el (display-tex-shell-buffer-action): New defcustom.
> 
> This results in a test error:
> 
> --8<---------------cut here---------------start------------->8---
> # make -C test test-custom-opts
> ...
> The following options might have problems:
> variable: display-tex-shell-buffer-action
>    value: display-buffer-in-previous-window
>     type: (cons :tag "Action" (choice :tag "Action functions" (choice :tag "Function" (const :tag "--" ignore) (const display-buffer-reuse-window) (const display-buffer-pop-up-window) (const display-buffer-same-window) (const display-buffer-pop-up-frame) (const display-buffer-full-frame) (const display-buffer-in-child-frame) (const display-buffer-below-selected) (const display-buffer-at-bottom) (const display-buffer-in-previous-window) (const display-buffer-use-least-recent-window) (const display-buffer-use-some-window) (const display-buffer-use-some-frame) (function :tag "Other function")) (repeat :tag "List of functions" (choice :tag "Function" (const :tag "--" ignore) (const display-buffer-reuse-window) (const display-buffer-pop-up-window) (const display-buffer-same-window) (const display-buffer-pop-up-frame) (const display-buffer-full-frame) (const display-buffer-in-child-frame) (const display-buffer-below-selected) (const display-buffer-at-bottom) (const display-buffer-in-previous-window) (const display-buffer-use-least-recent-window) (const display-buffer-use-some-window) (const display-buffer-use-some-frame) (function :tag "Other function")))) (alist :tag "Action arguments" :key-type symbol :value-type (sexp :tag "Value")))
> --8<---------------cut here---------------end--------------->8---

Sorry, I have no idea what this failure means.  In particular, the
value is correct for the defcustom, and works in practice, and also
fits the type of the defcustom (AFAICT).

The checks that cus-test.el does are not documented in any meaningful
way, and its output is not useful.  I didn't even know we had such a
test, and never ran it myself.

So I'm sorry, but I cannot make heads or tails out of this test
failure and its diagnostics.  Feel free to fix this, or ignore, or
anything else.