Re: Obsoleting font-latex-update-font-lock for fixing bug#37945

[Tassilo Horn]

Ikumi Keita <ikumi@ikumi.que.jp> writes:

> Actually, there is another "hard reset" in font-latex.el. The function
> `font-latex-add-to-syntax-alist' also sets `font-lock-set-defaults' to
> nil in order to apply the update in `font-latex-syntax-alist' to
> font-lock.
> I think something like the following patch would do the job:
> ----------------------------------------------------------------------
> diff --git a/font-latex.el b/font-latex.el
> index a7076162..d74ccace 100644
> --- a/font-latex.el
> +++ b/font-latex.el
> @@ -1223,8 +1223,10 @@ triggers Font Lock to recognize the change."
>    (set (make-local-variable 'font-latex-syntax-alist)
>         (append font-latex-syntax-alist list))
>    ;; Tell font-lock about the update.
> -  (setq font-lock-set-defaults nil)
> -  (font-latex-setup))
> +  ;; (setq font-lock-set-defaults nil)
> +  (font-latex-setup)
> +  (dolist (elt list)
> +    (modify-syntax-entry (car elt) (cdr elt) font-lock-syntax-table)))
>  
>  (defun font-latex-syntax-propertize-function (start end)
>    "The `syntax-propertize-function' for (La)TeX documents."
> ----------------------------------------------------------------------
> The call to `font-latex-setup' is there only to keep the variable
> `font-lock-defaults' in sync with `font-latex-syntax-alist', just for
> not confusing debug.
> Maybe `font-lock-flush' should be added as well.

Good catch, I've committed a slightly modified (commented) version of
your patch.

Thanks!
  Tassilo