What is simplest (and ideally, most performant) way to check whether an
hb_font_t contains a glyph for a sequence of code points? For single code
points, there's hb_font_get_glyph. If you already know the glyph ID (or
glyph name, when the font face has glyph names defined), there's
hb_font_glyph_from_string.

But what if I want to check whether the face has a single glyph for a
ligature or grapheme cluster, such as "لا", "🇨🇦", or "👮🏽‍♀️"?

Thank you,
Konstantin
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