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Hash : c52ddab7
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Date : 2013-10-16T13:42:38
[arabic] Make ZWJ prevent ligatures instead of facilitating it Unicode 6.2.0 Section 16.2 / Figure 16.3 says: "For backward compatibility, between Arabic characters a ZWJ acts just like the sequence <ZWJ, ZWNJ, ZWJ>, preventing a ligature from forming instead of requesting the use of a ligature that would not normally be used. As a result, there is no plain text mechanism for requesting the use of a ligature in Arabic text." As such, we flip internal zwj to zwnj flags for GSUB matching, which means it will block ligation in all features, unless the font explicitly matches U+200D glyph. This doesn't affect joining behavior.
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