[Orgmode] Fontify whole heading line

[Sébastien Vauban]

Hi,

I've set:

--8<---------------cut here---------------start------------->8---
(setq org-fontify-whole-heading-line t)
--8<---------------cut here---------------end--------------->8---

and would like to have the `org-level-1' underlined. To do so, in my
`color-theme.el':

--8<---------------cut here---------------start------------->8---
(org-level-1 ((t (:foreground "cornflower blue" :underline t :weight bold 
:height 1.8 :family "Arial"))))
--8<---------------cut here---------------end--------------->8---

Though I see the background color applied on the whole heading line (when in
SHOW-ALL mode), the underline is _not_. Is there a reason/fix for this?

Best regards,
  Seb

-- 
Sébastien Vauban