Re: Better emoji support

[Robert Pluim]

>>>>> On Mon, 12 Jul 2021 10:27:58 +0200, Robert Pluim <rpluim@gmail.com> said:
    Robert> Yes. I think this only implements one of the four items in there for
    Robert> emoji support, but theyʼre all fairly orthogonal.

Hi Eli,

Now that Iʼve looked at the patch again, I think I need some
guidance.

tr51 defines which codepoints have the 'Emoji' property, and
which additionally have the 'Emoji_Presentation' property. The latter
means they should in the absence of a variation selector be displayed
as emoji.

My current implementation assigns codepoints with the
'Emoji_Presentation' property to the 'emoji' script, since thatʼs all
we have to work with regarding font selection. But there are
codepoints that donʼt have that property that *could* be displayed as
emoji, so perhaps I should base it off the 'Emoji' property instead?
(with a small exception for codepoints <= #xAE).

(thereʼs probably a similar question for 'Extended_Pictographic' that
needs investigation)

Robert
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