bug#43702: Emacs master: Incorrect highlighting in regexp isearch.

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 01 Oct 2020 22:20:07 +0300
> Cc: Alan Mackenzie <acm@muc.de>, 43702@debbugs.gnu.org
> 
> >> Maybe better to do what Drew proposed: to distinguish the odd groups
> >> from the even groups, i.e. to have only 2 additional faces
> >> (a brighter face like the current isearch-group-1 for the odd groups,
> >> and a darker face for the even groups).
> >
> > I like the idea.
> 
> Implemented now on the trunk where isearch-group-odd is created
> from the isearch-group-1 face, and isearch-group-even
> from the isearch-group-4 face.
> 
> The result is quite nice:

Nice is in the eyes of the beholder: I liked the previous way better.