bug#44020: 28.0.50; Prefer selection of colour emoji fonts?

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Robert Pluim <rpluim@gmail.com>,  Eli Zaretskii <eliz@gnu.org>,
>   44020@debbugs.gnu.org
> Date: Sat, 17 Oct 2020 08:38:10 +0200
> 
> Alan Third <alan@idiocy.org> writes:
> 
> > On the other hand it comes preinstalled, it only works on Apple
> > devices, and Noto Color Emoji doesn't work on Apple devices. I'm not
> > sure we'd really be "promoting" it.
> 
> On the third hand, since it's preinstalled, Emacs doesn't need to
> mention it, because it's always there, and Emacs won't have problems
> displaying the characters it offers.

Are you sure?  What exactly makes sure Emacs won't have any problems
in those cases?  For starters, does Emacs really know that a given
character belongs to "Emoji"?  And if it does, does it know how to
filter fonts that support Emoji?