bug#25890: 26.0.50; `color-values` gives wrong value

[Eli Zaretskii]

> From: Rasmus <rasmus@gmx.us>
> Date: Mon, 27 Feb 2017 15:05:46 +0100
> 
> I try to get the color value of my background, "light yellow", with
> color.el.  However, `color-values` from faces.el returns the wrong value.
> 
>   (color-values "#ffffff")      => (65280 65280 65280) ; The max values.

Are you sure?  What does the below produce?

   (color-values "#fffffffff")

>   (color-values "#ffffe0")      => (65280 65280 57344) ; Light yellow hex.
>   (color-values "light yellow") => (65535 65535 57568) ; The potential bug.

On my system, I get these results:

  (color-values "#ffffff")      => (65535 65535 65535)
  (color-values "#ffffe0")      => (65535 65535 57568)
  (color-values "light yellow") => (65535 65535 57568)

> That is the color value of "light yellow" exceeds the maximum value as
> defined by the color values of white (cf. `color-rgb-to-hex').  This means
> that the color.el functions won't work.

I think this means your color resolution is greater than 24 bits.  Or
maybe I don't understand how the above affects your code.