bug#1663: color-gray-p for Emacs.app

[Alex Schröder]

Apparently all the colors on my system are gray:

(dolist (item color-name-rgb-alist)
  (let ((color (car item)))
    (when (not (color-gray-p color))
      (error color))))
=> nil

(length color-name-rgb-alist)
=> 657

(color-gray-p "red")
=> t

In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, NS apple-appkit-824.48)
 of 2008-12-21 on Pyrobombus.local
Windowing system distributor `Apple', version
97.112.112.108.101.45.97.112.112.107.105.116.45.56.50.52.46.52.56
configured using `configure  '--with-ns''