bug#56182: 28.1; Display of SVG file with transparent background is incorrect

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 11 Sep 2023 20:10:24 +0100
> From: Alan Third <alan@idiocy.org>
> 
> I've checked with the one Windows box I have available to me and it
> looks like this is the same there, so I've attached a patch that I
> hope will fix this. All it's doing is reversing bytes 1 and 3 (from
> the right) of the colours, so when it's used in the SVG code it should
> display correctly.
> 
> I can't check it as I don't have a Windows development box. If someone
> can confirm that this 1. compiles and 2. fixes the problem that would
> be great.
> 
> I found it easy to check by setting the theme to "light blue" and
> loading etc/images/down.svg. The correct result should have a black
> triangle on a blue background, but incorrect is a black triangle on a
> yellow background.

Thanks, the patch builds fine on MS-Windows, and it solves the
problem, including the recipe in the original message that started
this bug.

Please install on the emacs-29 branch, and thanks.