NEW emacs32 master branch support scaling for underline, overline... face

Related email discussion: **https://lists.gnu.org/archive/html/emacs-devel/2026-09/msg00514.html**

Github commit: https://github.com/emacs-mirror/emacs/commit/4b76d570d0249d0bd422462361dd627555281ffe

Example

- before

- after




Fast enable feature
---

(setq underline-line-scaling-flag t

overline-line-scaling-flag t

strike-through-line-scaling-flag t)



Test code
---
(progn

(insert

"\\n\\n"

(propertize

"HELLO GNU EMACS"

'font-lock-face

`(:underline (:style wave :color "red")

:overline t

:strike-through t

))))

https://redd.it/1x0sgu7
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