bug#29456: [PATCH] Add command for cycling between CSS color formats

[Eli Zaretskii <eliz@gnu.org>]

> From: Tom Tromey <tom@tromey.com>
> Cc: Simen Heggestøyl <simenheg@gmail.com>,
>   29456@debbugs.gnu.org,  tom@tromey.com,  monnier@iro.umontreal.ca
> Date: Mon, 27 Nov 2017 10:41:29 -0700
> 
> >>>>> "Eli" == Eli Zaretskii <eliz@gnu.org> writes:
> 
> Eli> The latter follows the X color definitions, so why does css-mode.el
> Eli> need a different interpretation of the hex-RGB notation?
> 
> CSS color names came from X a long time ago, but their mapping to rgb is
> now part of the CSS specification.  And, apparently there were multiple
> versions of this file coming from X.  The Emacs one would be ok provided
> the lists are identical and will always remain so.  Otherwise, css-mode
> needs its own list.

Sorry, I don't understand: what list are you talking about?

> Eli> My fear is that someone will mix css-mode functions with those from
> Eli> elsewhere in Emacs, and will bump into confusing and contradicting
> Eli> results.  Is it possible to avoid that?
> 
> Using "css-" in the name seems sufficient to me.  Maybe a comment
> explaining this would help as well.

A comment will help, but I'm actually wondering why does css-mode need
to use 12-bit or 16-bit per component RGB notation?  Why not use only
8-bit, as in #RRGGBB?  The problems only happen in converting 8-bit
RGB notations to higher number of bits.