Turns out that zeroing marks by GDEF in Tibetan (commit
d5bd0590ae2fbc7b0dee86385a565aef00ffb835) has significantly regressed
our numbers for the Windows himalaya.ttf font. :(
The main problem seems to be the handling of
0F3C;TIBETAN MARK ANG KHANG GYON;Ps;0;ON;;;;;Y;TIBETAN LEFT BRACE;;;;
0F3D;TIBETAN MARK ANG KHANG GYAS;Pe;0;ON;;;;;Y;TIBETAN RIGHT BRACE;;;;
both of which the GDEF table in himalaya.ttf classifies (incorrectly) as
class 3. Result:
http://ec2-54-226-13-158.compute-1.amazonaws.com/testcase-view.html?file=out/fonts/win8/himalaya.ttf/texts/tibt/wikipedia/bo.txt.diffs#P_1_1_77
and lots of similar examples where these characters are used.
Sigh.
JK
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