[HarfBuzz] problem with hb_ot_layout_lookup_would_substitute

[Werner LEMBERG]

> For your 'c' parameter, you want to be using the glyph ID of the
> default 'f' glyph, not the character code 'f'.  That's what lookup 1
> will apply to.

Doh.  Thanks, it works now.  It's *really* time that HarfBuzz gets
documented :-)


    Werner