bug#2066: Face `unspecified' inheritance ignores face-remapping-alist

[Chong Yidong]

> Faces with an unspecified `inherit' attribute inherit from `default',  
> right?
>
> Unfortunately, this mechanism does not respect remapped faces (face- 
> remapping-alist).  Faces, by default, seem to inherit from the frame  
> default.  To demonstrate:
>
> emacs -Q
> (fundamental-mode)
> (setq face-remapping-alist '((default . highlight)))
> (insert (propertize "test" 'face 'fringe))

I don't see any bug here.  The "test" string inserted into the buffer
has a background different from `highlight', but that's because its
background is not unspecified:

(defface fringe
  '((((class color) (background light))
     :background "grey95")
    (((class color) (background dark))
     :background "grey10")
    (t
     :background "gray"))
  "Basic face for the fringes to the left and right of windows under X."
  :version "21.1"
  :group 'frames
  :group 'basic-faces)