bug#12213: 24.1; Cannot customize help-argument-name face

[Raffaele Ricciardi]

Dear Sirs,

customizing the `help-argument-name' face has no effect.

How to reproduce:
- emacs -Q
- M-x customize-face RET help-argument-name RET
- set face foreground (i.e. "yellow")
- click on "Set for this session"
- M-x describe-face RET help-argument-name RET
- all the fields in the face specification are "unspecified"

Customizing other faces, like 'font-lock-comment-face', works.

Best Regards
--

In GNU Emacs 24.1.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2012-06-12 on debian
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
Configured using:
 `configure '--prefix=/home/lele/bin/emacs/emacs-24.1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Custom

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x c u s t o - f a <tab> <return> h e l p - <tab>
<return> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <down-mouse-1> <mouse-1> <help-echo>
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> y e r r o <backspace>
<backspace> <backspace> r r o m <backspace> <backspace>
<backspace> <backspace> l l o w <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> <help-echo> <help-echo> <help-echo> <help-echo>
<down-mouse-1> <mouse-1> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> M-x d e s c r i <tab> f a <tab> <return>
M-p <return> M-x r e p o <tab> r <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Creating customization items...
Creating customization items ...done
Resetting customization items...done
Creating customization setup...done
Type C-x 1 to delete the help window.
Making completion list...

Load-path shadows:
None found.

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