[luatex] [luatex-fonts] Negative font feature

[Khaled Hosny]

Currently, negative feature enable the feature instead of disabling it:

\input luatex-fonts
\font\xxx=lmroman10-regular.otf:-liga\xxx
fi fl ff ffi ffl
\bye

This will activate 'liga' feature. The attached patch should fix it
(looks like we must remove the feature from the table, "no" desn't make
a difference.)

Regards,
 Khaled

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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