bug#4381: 23.1.50; Cocoa Emacs: face background for 'region set in ns-win.el after .emacs

[Stefan Monnier <monnier@iro.umontreal.ca>]

>>> Colors there are defined for dark and light backgrounds, which
>>> is not supported by the NS implementation.
>> Why isn't it supported?
> The only system-defined selection color on NS platforms is for the
> unconfigurable standard background color of white.

I'm not sure we're talking about the same thing.  The lisp/faces.el
notion of dark/light background doesn't have anything to do with the
desktop's background, but with the Emacs buffers's default background
(i.e. whether the background color of the `default' face is rather
light or rather dark).

> --- faces.el.~1.446.~	2009-09-05 15:33:48.000000000 -0400
> +++ faces.el	2009-09-23 23:06:19.000000000 -0400
> @@ -2281,6 +2281,8 @@ terminal type to a different value."
>  (defface region
>    '((((class color) (min-colors 88) (background dark))
>       :background "blue3")
> +    (((class color) (min-colors 88) (background light) (type ns))
> +     :background "ns_selection_color")
>      (((class color) (min-colors 88) (background light))
>       :background "lightgoldenrod2")
>      (((class color) (min-colors 16) (background dark))

Could you add a comment explaining why you put (background light) in
the specs?  I guess it's because the ns_selection_color is (almost)
always defined with the assumption that it will be used on text
displayed on a light background., right?


        Stefan