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

[Drew Adams]

> Even the color scheme designed by Drew has problems.

What problems?

> So users and theme authors need to decide themselves
> how many and what colors they want to use.

I certainly agree with that.

It's sufficient to define a set of faces (I suggested
eight) and use those.

Anyone who want the effect of fewer faces can just
customize any of them to repeat any of the others.

It's easy to get the effect of using only 2 faces
by customizing the eight faces provided.