bug#43381: 27.1.50; Maybe wrong cursor FG color in NS port

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: alan@idiocy.org,  43381@debbugs.gnu.org,  dale@codefu.org
> Date: Fri, 18 Sep 2020 15:07:05 +0200
> 
> > I thought to define it only for the cursor face.  And if that needs
> > some special treatment on the C level, it shouldn't be hard to tweak
> > that.
> 
> Ah, right...  but then that'd be used on all characters the cursor is
> over, no matter what the background colour of the cursor is?

No, only when the contrast with the other color is too low.