[HarfBuzz] Trouble with clusters and accented latin characters

[Lóránt Pintér]

Hi,  

I'm trying to shape the word "tér" with HarfBuzz, and this is what I get back:

hb_buffer_get_glyph_infos() after calling hb_buffer_add_utf8():

Char #0: { codepoint: 116, mask: 1, cluster: 0, var1: 0, var2: 0 }
Char #1: { codepoint: 233, mask: 1, cluster: 1, var1: 0, var2: 0 }
Char #2: { codepoint: 114, mask: 1, cluster: 3, var1: 0, var2: 0 }

…and after calling hb_shape():

Glyph #0: { codepoint: 86, mask: 1, cluster: 0, var1: 2, var2: 5 }
Glyph #1: { codepoint: 156, mask: 1, cluster: 1, var1: 2, var2: 5 }
Glyph #2: { codepoint: 84, mask: 1, cluster: 3, var1: 2, var2: 5 }


I believed up to now that each cluster corresponded to a character in the original string. Why is the letter "é" turned into two clusters here?

--  
Lóci

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