[OpenJDK 2D-Dev] [14] RFR JDK-8223558: Java apps do not support Myanmar fonts

[Alexey Ivanov]

Hello,

Please review the fix for JDK 14:

bug: https://bugs.openjdk.java.net/browse/JDK-8223558
webrev: http://cr.openjdk.java.net/~aivanov/8223558/webrev.00/

Problem description:
Java renders Myanmar script incorrectly. Some glyphs are not combined, 
which makes text unreadable.
For example, this glyph ကြ is made of two characters U+1000 and U+103C. 
Java renders two separate glyphs.

Workaround:
Enable ligatures or kerning on the font to get the correct rendering.

The fix:
Enables complex layout for base Myanmar characters (U+1000-U+109F).
Provides fallback font on Windows.
On Linux, fontconfig handles the fallback.

I ran awt/font tests, no new failures found.

-- 
Regards,
Alexey