"emacs-28.0.50 -q" and "emacs-28.0.50 -Q" with outline-minor-mode-highlight

[pauline-galea@gmx.com]

> Sent: Friday, May 28, 2021 at 6:27 AM
> From: "Stephen Berman" <stephen.berman@gmx.net>
> To: pauline-galea@gmx.com
> Cc: "Philip Kaludercic" <philipk@posteo.net>, "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> Subject: Re: "emacs-28.0.50 -q" and "emacs-28.0.50 -Q" with outline-minor-mode-highlight
>
> On Thu, 27 May 2021 20:13:25 +0200 pauline-galea@gmx.com wrote:
>
> >> Sent: Friday, May 28, 2021 at 5:34 AM
> >> From: "Philip Kaludercic" <philipk@posteo.net>
> >> To: pauline-galea@gmx.com
> >> Cc: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> >> Subject: Re: "emacs-28.0.50 -q" and "emacs-28.0.50 -Q" with
> >> outline-minor-mode-highlight
> >>
> >> pauline-galea@gmx.com writes:
> >>
> >> >> Sent: Friday, May 28, 2021 at 1:47 AM
> >> >> From: "Philip Kaludercic" <philipk@posteo.net>
> >> >> To: pauline-galea@gmx.com
> >> >> Cc: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> >> >> Subject: Re: "emacs-28.0.50 -q" and "emacs-28.0.50 -Q" with
> >> >> outline-minor-mode-highlight
> >> >>
> >> >> pauline-galea@gmx.com writes:
> >> >>
> >> >> >> I am guessing that you should first set outline-minor-mode-highlight
> >> >> >> then activate outline-minor-mode. Setting a variable directly usually
> >> >> >> does not perform any changes. - Philip
> >> >> >
> >> >> > No, that does not work.
> >> >>
> >> >> I just tried it using my local master checkout I just built this
> >> >> morning, and it worked... Are you sure your major mode initializes
> >> >> outline-minor-mode properly?
> >> >
> >> > Do you get different heading colours for the three heading levels below?
> >> >
> >> > ;;; * heading 1
> >> > ;; brief body
> >> > ;;;; ** subheading 1.1
> >> > ;; brief body
> >> > ;;;;; *** subsubheading 1.1.1
> >> > ;; brief body
> >>
> >> Yes, I'll attach a screenshot below. It's not pretty, but I notice a
> >> difference.
> >
> > All three subheaditgs look the same to me.  That was my point, the
> > result in not pretty and the capability requires more work.  For
> > instance, changing the faces would also change those heading
> > highlighting.  This does not seem to bother the maintainers whilst
> > expecting other to be ok with it, terning down requests for
> > improvements.
>
> After doing `M-: (outline-minor-mode-highlight-buffer)' I see the three
> headings in different colors.
>
> Steve Berman

Why is this all so difficult !!!

How do I use "outline-minor-mode-highlight-buffer".  It is not an interactive function.
Have tried executing with "C-x C-e" but nothing took effect.