[HarfBuzz] Beginner question: What are cluster levels?

[Jamie Dale]

Thanks, I also have another question related to what I mentioned yesterday:
Is there a reliable way to detect which glyphs are ligatures?

My current solution checks for gaps in the cluster indices of the shaped
glyph infos, but that also requires some special case handling to detect if
the last glyph in a sequence is a ligature. I was hoping
hb_glyph_info_t::mask might specify this, but as far as I can tell, it's
always set to 1 (I'm using version 1.0.5).

-Jamie.
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