Going through old Pango bugs to see if there is anything HarfBuzz related, I found this one which is still reproducible with HarfBuzz (marks over 2nd component of لله are placed over the 3rd one, marks over the other two components are placed correctly):
https://bugzilla.gnome.org/show_bug.cgi?id=437633 Regards, Khaled _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
