bug#21557: 25.0.50; HTML renders text invisible

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 28 Sep 2015 19:37:45 +0900
> From: Katsumi Yamaoka <yamaoka@jpl.org>
> Cc: rms@gnu.org, 21557@debbugs.gnu.org
> 
> On Mon, 28 Sep 2015 11:40:12 +0300, Eli Zaretskii wrote:
> > I think an Emacs-only solution would be preferable.  Can
> > shr-color-visible-luminance-min be adapted to a small number of
> > colors?  The simplest would perhaps be just overriding the foreground
> > color with something that is legible on the background color.
> 
> The most simplest way would be:
> 
> --- shr.el~	2015-08-02 22:23:44.000000000 +0000
> +++ shr.el	2015-09-28 10:34:41.025287800 +0000
> @@ -1044,3 +1044,3 @@
>  (defun shr-colorize-region (start end fg &optional bg)
> -  (when (or fg bg)
> +  (when (and (or fg bg) (>= (display-color-cells) 256))
>      (let ((new-colors (shr-color-check fg bg)))
> 

Richard, does this solve your problems?

I wonder whether 256 above should be replaced with a much lower
number, like 88, perhaps?