[HarfBuzz] emoji shaping

[Kelvin Ma]

Since emojis have to be shaped separately from all the other text, how do I
separate out the emojis from the text? Previously I just had an enormous
list of unicode emoji codepoints and I would filter them out beforehand,
but this doesn’t work with ligature-emojis like family, flag, or skin color
emojis, which don’t have singular unicode codepoints. What’s the preferred
way for handling emojis in text shaping then?
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