bug#47316: 27.1; commands with color input should use a common color chooser

[Eli Zaretskii]

On March 22, 2021 1:01:13 PM GMT+02:00, "scame via Bug reports for GNU Emacs, 
the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> wrote:
> set-foreground-color uses a color chooser: read-color.
> 
> customize-face uses something else which looks more readable IMO,
> though
> the usefulness of the underline is debatable:
> 
> https://necromuralist.github.io/posts/changing-emacs-font-colors/color_selector.png
> 
> Other commands like set-face-foreground, highlight-regexp and others
> show only
> color names, but not the colors themselves.
> 
> All color input commands should use a common color selector which
> shows the
> actual colors too.

read-color will show you the colors from which you can select if you type '?', 
the standard Emacs command that requests the list of possible candidate values.