[HarfBuzz] MarkAttachmentType lookup flag has no effect

[Behdad Esfahbod]

Thanks Khaled.  They are *supposed* to work.  I'll look into this later in the
week.

behdad

On 07/15/2012 04:01 AM, Khaled Hosny wrote:
> It seems that the (older) MarkAttachmentType lookup flag is not applied
> by HarfBuzz, while the (newer) UseMarkFilteringSet flag works fine.
> 
> Here is the same font font once using MarkAttachmentType and once using
> UseMarkFilteringSet with the same mark glyph class in both cases (and it
> is the only one used), and if applied the final dots in the words تختة,
> تخنة, تخئة, تخثة and تخٹة should be raised up whether vowel marks are
> used or not.
> 
> http://khaledhosny.org/files/tmp/hussaini-nastaleeq_MarkAttachmentType.ttf
> http://khaledhosny.org/files/tmp/hussaini-nastaleeq_UseMarkFilteringSet.ttf
> 
> Regards,
>  Khaled
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