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

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> > Great!  I guess we should add a C-level predicate like font-color-p?
>> 
>> What would it accept? Font entities or objects?
>
> What every other display-*-p function accepts: a frame or a terminal.

This is about the primitive that display-color-fonts-p will use, so it
should take a font object (if we add it).