bug#53255: highlight-regexp should show faces with their properties applied when selecting a face

[Kévin Le Gouguec]

Kévin Le Gouguec <kevin.legouguec@gmail.com> writes:

>    (Although I don't know if it's the hour getting late or something,
>    but now that I actually try out C-u M-s h r I just… can't get any
>    highlighting, with or without my patch on top.  The completion works
>    fine, but when I exit the minibuffer… nothing gets highlighted.
>
>    Ugh.  Will sleep on it)

OK, turns out it really was well past bedtime for me; C-u sets the
regexp *group*, I don't know why, I was certain it was a toggle to
choose the face.

So please disregard this parenthesized tangent 🙃 and let the patches
and screenshots speak for themselves.  Sorry for the noise.