bug#51556: 29.0.50; Poor contrast of Customize SVG icons with dark backgrounds

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 2 Nov 2021 07:41:43 -0700
> Cc: Jim Porter <jporterbugs@gmail.com>, 51556@debbugs.gnu.org, 
> kevin.legouguec@gmail.com
> 
> Thinking about how to fix this in emacs-28, we discussed adding a face
> and just removing the foreground color from the svg.

Foreground or background?

AFAIR, we already are able to display SVG with non-default background.
As for foreground: what does it mean to remove the foreground from an
image?  Aren't the foreground colors the most important part of an
image?