[HarfBuzz] Decomposition and soft dotted characters

[Khaled Hosny]

Hi All,

This TeX.SE question[1] shows an “interesting” effect of decomposition
and soft dotted characters; Gentium lacks ї (U+0457, CYRILLIC SMALL
LETTER YI) so HarfBuzz decomposes it into і (U+0456) and U+0308 so we
end up with three dots.

Not sure what to do here though, but IMO unless the font has lookups to
remove the soft dot, such decomposition is wrong and should be avoided
as it would just fool applications depending on HarfBuzz output to
determine if font fallback is needed or not since, IMO, using a fallback
font is better here.

Regards,
Khaled

1. http://tex.stackexchange.com/q/126693/729