Subject: bug#78696: 14.0.9; Folding of math macros with a function spec is broken

From: Rahguzar <[email-masked]>
Date: Wed, 04 Jun 2025 22:40:13 +0500

Hi Paul,

"Paul D. Nelson" <[email-masked]> writes:

> Thanks Raghuzar.  The issue is the result of this change:
>
> --8<---------------cut here---------------start------------->8---
> diff --git a/tex-fold.el b/tex-fold.el
> index 766270ef..78e5b822 100644
> --- a/tex-fold.el
> +++ b/tex-fold.el
> @@ -901,6 +901,12 @@ TYPE can be either `env' for environments, `macro' for macros or
>             (goto-char (1+ start))
>             (LaTeX-find-matching-end)
>             (point))
> +          ((eq type 'math)
> +           (goto-char (1+ start))
> +           (if (zerop (skip-chars-forward "A-Za-z@"))
> +               (forward-char)
> +             (skip-chars-forward "*"))
> +           (point))
>            (t
>             (goto-char start)
>             (TeX-find-macro-end)))))
> --8<---------------cut here---------------end--------------->8---
>
> The intent here was that "math macros" built-in to tex-fold don't take
> arguments, but this is not the case for the custom one you provide.
>
>> (setq TeX-fold-math-spec-list `((,(lambda (text) (propertize text 'face '(underline))) ("underline"))))
>
> Is there a reason to prefer this vs. the same with
> TeX-fold-macro-spec-list in place of TeX-fold-math-spec-list?

The reason for why it is in TeX-fold-math-spec-list is that when I
started with Emacs I stole it from Tecosaur's config. There are quite a
few function specs in my TeX-fold-math-spec-list e.g. for sqrt, frac,
mathcal, mathfrak and mathbb etc and most of them are relevant only for
math. Should they be moved to TeX-fold-macro-spec-list?

> Paul