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

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

> That's orthogonal, and can only be done once the predicate is
> implemented.

How so?  FC_COLOR is used during the font matching process, so it can
only be a font spec or entity attribute.

So a display-specific predicate could only be implemented like this:

  (defun display-color-font-p (frame)
    "DOC"
    (find-font (font-spec :color t) frame))