[HarfBuzz] Rendering Thai

[John Tapsell]

Hi,

  With harfbuzz.old (Qt's version), when I render the string: "ซ้ำ" I
get the output:

http://imageupload.org/download.php?id=132574&type=2

W = Waree font
T = Tahoma font
N = Nokia Pure Text AS font

The first one is rendered correctly.  The "o" thingy is rendered in
the right place.  The second and third ones are incorrectly rendered.

I get the same, incorrect, result with harfbuzz-ng, using the command:

./hb-view --annotate tahoma.ttf "ซ้ำ" > thai.png

It renders incorrectly in openoffice and correctly in gedit, using
Tahoma for both.

John