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

[Robert Pluim]

>>>>> On Mon, 01 Aug 2022 16:53:59 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> 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 21:47:37 +0800
    >> 
    >> Eli Zaretskii <eliz@gnu.org> writes:
    >> 
    >> > That's what I thought we agreed to do, yes.  (But do we only support
    >> > Cairo with HarfBuzz?)
    >> 
    >> No, color fonts are supported under Cairo even if Emacs isn't built with
    >> HarfBuzz.

    Eli> But we are talking about color Emoji, not just about color fonts.
    Eli> Will a Cairo build without HarfBuzz support Emoji sequences?

Yes, but they wonʼt display anywhere near as well as with Harfbuzz:
they tend to show up as double/triple/more width.

Robert
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