7017058: Malayalam glyph substitution is failing for Malayalam with Windows Kartika font.
8191130: Sinhala text rendering problem with C+VIRAMA+ZWJ+RA/YA+V
8195836: opentype:Bengali: "Khanda Ta" shaping issue with U+09A4 TA, U+09CD virama, U+200D ZWJ
Reviewed-by: serb, psadhukhan