Sébastien Vauban wrote:
>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?

I cannot reproduce this with 

Org-mode version 6.36trans on 

GNU Emacs 23.2.1 (i486-pc-linux-gnu, GTK+ Version 2.20.0) of
 2010-05-16 on raven, modified by Debian

I've customize the face `org-level-1' to be underlined and, well:
everything besides the key word is, spaces included.

HTH
  -- David
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