[HarfBuzz] Inter-glyph spacing

[Martin Hosken]

Dear Simon,

> 	What also confuses me is that the result is very font-specific. SIL fonts are 
> squashed. Times and Optima render perfectly: Pango and Harfbuzz equivalent. 
> Adobe Garamond Pro and Caslon Pro are horrible, with some very strange 
> inter-glyph spacing; in particular there is too much space after every letter 
> "a", and too little after an "s".

What version of harfbuzz-ng?
Did you compile it --with-graphite2?

Perhaps this is a graphite integration bug?

Yours,
Martin