bug#56691: outline-minor-mode displays navigation arrow buttons as emojis

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: larsi@gnus.org,  rpluim@gmail.com,  56691@debbugs.gnu.org,
>   hello@paulwrankin.com
> Date: Mon, 01 Aug 2022 21:20:28 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I thought we wanted a capability indication, not something that
> > actually looks for installed fonts.  AFAIU, if there are no color
> > fonts on the user's system, the above will tell Emacs color fonts
> > aren't supported.  That's not what we wanted, based on earlier
> > discussions.
> 
> Then this could be implemented very simply:
> 
>   (or (featurep 'haiku)
>       (featurep 'cocoa)
>       (featurep 'cairo))

That's what I thought we agreed to do, yes.  (But do we only support
Cairo with HarfBuzz?)