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: Tue, 15 Sep 2020 14:22:20 +0200
> 
> > We should fix the documentation.
> 
> Or should we fix the code?  As the example demonstrates, this makes some
> of the inverse-blinked text difficult to read.

Any specific suggestions for a fix?

> Presumably the colour distance between the cursor and the default
> face's background is more legible?

If you imply that we should sometimes refuse to merge faces, I'd
object to that, since we never do such things anywhere.

Maybe it's enough to define (and handle) a distant-foreground color
for the cursor face?