Hi Behdad, I just noticed that hamza above and below marks (U+0654, U+0655), are reordered after Arabic vowel marks because they have much higher combining classes, 230 and 222 (the "generic" combining class above and below, respectively), which breaks mkmk positioning.
I tried to make a patch to handle them like the shadda, but I'm not sure how safe it is with such generic combining classes. Regards, Khaled _______________________________________________ HarfBuzz mailing list HarfBuzz@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/harfbuzz
