bug#17808: 24.4.50; vc-annotate colors

[Eli Zaretskii <eliz@gnu.org>]

> From: Juri Linkov <juri@jurta.org>
> Date: Wed, 02 Jul 2014 02:18:27 +0300
> 
> > Currently vc-annotate uses dark background even when the default background
> > is light.  Would be nicer to have another option similar to the existing
> > `vc-annotate-background' that will define the default foreground
> > (instead of the default background) and put colors from color-map
> > on the background instead of the foreground:
> 
> Actually much cleaner would be to add a dedicated user option
> that will define whether to apply the color map to the background
> or to the foreground.  When applied to the background with the
> default light background, colors need to be less saturated,
> so the saturation is decreased from 75% to 20% for light backgrounds.
> Also `vc-annotate-background' doesn't need the default value "black"
> because the background will be dark on dark environments anyway.

Did anyone think of just using the current default background color?
If not, why not?