[HarfBuzz] how to get Stylistic Alternates in salt feature

[Fahad Al-Saidi]

Hi All,

is there a way to know how many Stylistic Alternates in salt feature, so I
can build GUI to choose between them?

I am trying to fix this bug [1] in scribus. The font is Ponomar Unicode[2]
which has 8  Alternate Forms for U+1F545.

Thanks in advance,
Fahad

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[1] https://bugs.scribus.net/view.php?id=15088
[2] http://sci.ponomar.net/fonts.html
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