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

[Robert Pluim]

>>>>> On Fri, 29 Jul 2022 15:38:39 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Eli Zaretskii <eliz@gnu.org> writes:
    >> But the option's value is not a simple scalar, it is a list of
    >> preferences, and they are supposed to be used in the order listed when
    >> possible.  How do you reconcile that with "I know what I'm doing"?

    Lars> If there is only one element in `icon-preference', we could make
    Lars> icon-string use that no matter whether we thing Emacs supports it or
    Lars> not -- that'd let the user override the machinery completely, which
    Lars> might be handy.

    Lars> Or have elements like (emoji . force) to force it.

Or have it be like face specifications in defface, which can check
terminal properties.

Robert
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