23.0.60; Face inheritance only works for some faces in emacs-unicode

[Lawrence Mitchell]

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

When using ttf fonts such as Bitstream Vera Sans Mono, face
inheritance does not seem to work correctly.  The included file
demonstrates what I believe to be a bug:

Defining a face with an attribute that inherits from the
`default' face does not use the same fontset.  Equally,
inheriting from no face at all produces an unexpected result.  If
the defined face inherits from `fixed-pitch', the fontset is
correct.

The following command may be used to demonstrate the bug using
the attached file:

emacs -Q -fn "Bitstream Vera Sans Mono" --load face-inherit-bug.el

Using a standard X font does not show the same bug, that is, the
following works and all faces display as expected:

emacs -Q -fn 7x14 --load face-inherit-bug.el

face-inherit-bug.el
Description: face inheritance bug

Cheers,

Lawrence

In GNU Emacs 23.0.60.2 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-01-11 on lamacq.ph.ed.ac.uk
Windowing system distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure  '--enable-font-backend' '--with-xft' 
'--prefix=/scratch/s0198183/applications/emacs-unicode' '--with-rsvg' 
'--with-mmap' '--cache-file' 'foo''

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_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t