bug#45829: 28.0.50; Some tweaks to the color widget, from wid-edit+.el

[Eli Zaretskii]

> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Date: Fri, 15 Jan 2021 22:22:38 +0000
> Cc: 45829@debbugs.gnu.org
> 
> >  (define-widget 'color 'editable-field
> >    "Choose a color name (with sample)."
> >    :format "%{%t%}: %v (%{sample%})\n"
> >    :value-create 'widget-color-value-create
> > -  :size 10
> > +  :size (1+ (apply #'max (mapcar #'length (defined-colors))))
> 
> Is defined-colors guaranteed to return non-nil?

Not according to its doc string.