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

[Simen Heggestøyl]

On Fri, Mar 3, 2017 at 3:08 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> Thanks, I installed my change with minor variations, and I'm marking
> this bug done.

Thanks, Eli. The changes makes sense to me, but I've still got one
problem. I'm working with web colors, where color codes are specified
with either one or two digits per component (meaning that both "#fff"
and "#ffffff" specify the brightest possible value, named
"white"). But:

(apply #'color-rgb-to-hex `(,@(color-name-to-rgb "#ffffff") 2))
    => "#fefefe"

(apply #'color-rgb-to-hex `(,@(color-name-to-rgb "#fff") 2))
    => "#efefef"

Where I would like both to give back "#ffffff". Does this mean that I
have to ensure that input to `color-name-to-rgb' uses 4 digits per
component? Would it make sense for it to get a new optional parameter
`DIGITS-PER-COMPONENT', like `color-rgb-to-hex' did?

-- Simen