bug#6918: Colors of xbm image are swapped on Windows

[Eli Zaretskii]

> From: Jason Rumney <jasonrumney@gmail.com>
> Date: Thu, 10 Oct 2019 19:59:46 +1300
> Cc: Lars Ingebrigtsen <larsi@gnus.org>, kzhr@d1.dion.ne.jp, 
> 6918@debbugs.gnu.org
> 
> On Fri, 27 Sep 2019 at 17:30, Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > How do you suggest to test the proposed change, to make sure it
> > doesn't break something else?  Any pointers to those monochrome PBM
> > icons used in the past, for example, or any other files?
> 
> Are the icons not still under etc/images?  It looks like they are to me.

There are *.pbm icons in etc/images/, and then there are *.ico files
in nt/icons/.  Which ones did you have in mind?

> IIRC, it was gnus that was missing xpm versions, so those were the
> icons that were actually used in practice, but it was many years
> (decades even) ago, and you might have to dig through the git history
> to find the exact icons.

So you are saying that if, after the change, the PBM icons we have in
the repository display fine, the change is OK?

As for digging through VCS history: I'm not sure I understand what
should I be looking for there.  Can you elaborate a bit?

Thanks.