2018-03-07 19:08 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:

> > From: Fabrice Popineau <fabrice.popineau@gmail.com>
> > Date: Wed, 7 Mar 2018 15:22:37 +0100
> > Cc: 30672@debbugs.gnu.org
> >
> > Characters are inserted this way :
> >
> > #(" - apache" 0 1 (face (:family "all-the-icons" :height 2.4) display
> (raise -0.24) rear-nonsticky t
> > font-lock-ignore t))
> >
> > with the square being \xe909 .
> >
> > The family is taken into account if I do :
> >
> > (message #(" - apache" 0 1 (face (:family "all-the-icons" :height 2.4)
> display (raise -0.24) rear-nonsticky t
> > font-lock-ignore t)))
> >
> > iie the glyph is displayed in the minibuffer, but not if I do
> >
> > (insert #(" - apache" 0 1 (face (:family "all-the-icons" :height 2.4)
> display (raise -0.24) rear-nonsticky t
> > font-lock-ignore t)))
> >
> > in the *scratch* buffer.
>
> What if you turn off font-lock-mode in *scratch* -- does this work
> then?
>

Bingo! Yes, this is working.

Moreover, the anwser is as plain as day now.
The parameter 'font-lock-ignore' is meant to be interpreted not by the
font-lock package
but by the font-lock+ package !

Somehow, all-the-icons is missing this prerequisite.
I probably loaded it accidentaly sometime before, reason while I have seen
the icons.

Thanks for the help. You can close the bug.

Fabrice