[HarfBuzz] Tai Tham Ligature u1A31 RANA u1A2C NYA not formed in FFX v. 21

[Ed Trager]

Hi, List,

Which version of HarfBuzz-NG is in the latest Firefox v. 21 on the beta
channel?

When I run hb-view version 0.9.16 against my Tai Tham font,
the ligature u1A31 RANA + u1A2C NYA is formed correctly (as shown in the
first attachment, out5.png).

However, when I render the same combination in Firefox v. 21.0, the
RANA+NYA ligature is *not* formed ( but, curiously, the u1A36 NA + u1A63
VOWEL SIGN AA ligature is correctly formed as expected ) (image also
attached).

So it looks like a rather odd bug in FFX perhaps?

- Ed
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