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bug#54329: 28.0.91; custom-prompt-customize-unsaved-options does not ret
From: |
Eli Zaretskii |
Subject: |
bug#54329: 28.0.91; custom-prompt-customize-unsaved-options does not return nil |
Date: |
Thu, 10 Mar 2022 19:09:49 +0200 |
> From: Sebastian Miele <iota@whxvd.name>
> Date: Thu, 10 Mar 2022 17:19:07 +0100
>
> In an emacs -Q, evaluate
>
> (add-hook 'kill-emacs-query-functions
> 'custom-prompt-customize-unsaved-options)
>
> (progn
> ;; Somthing like the following may be done, e.g., by
> ;; ‘activate-transient-input-method’:
> (setq default-transient-input-method "TeX")
> (customize-mark-as-set 'default-transient-input-method))
>
> and hit C-x C-c. When asked about whether to examine the unsaved
> options, say yes.
>
> Expected: Emacs does not terminate, so that I can examine.
>
> Actual behavior: Emacs terminates.
>
> The following diff fixes this issue (and a documentation bug):
>
> diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
> index c2ddaeb7b1..77840c4b65 100644
> --- a/lisp/cus-edit.el
> +++ b/lisp/cus-edit.el
> @@ -1531,12 +1531,11 @@ customize-apropos-groups
> ;;;###autoload
> (defun custom-prompt-customize-unsaved-options ()
> "Prompt user to customize any unsaved customization options.
> -Return non-nil if user chooses to customize, for use in
> +Return nil if user chooses to customize, for use in
If you want to prevent Emacs from terminating, you can simply return
nil from your hook function. I see no reason to change the semantics
of the return value for a single use case: this function was evidently
assuming a different use case, and it exists in this shape long enough
to prevent us to change its behavior in such a radical way.
Thanks.