bug#21557: 25.0.50; HTML renders text invisible

[Katsumi Yamaoka]

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)))