[HarfBuzz] Mark zeroing for East Asian scripts

[Jonathan Kew]

On 27/1/15 22:06, Behdad Esfahbod wrote:

> Ok, CoreText does actually do something.  I think it's using heuristics based
> on the mark outlines...

Hmm, so it does.

>
> So, we have to choose to match Uniscribe (my current preference), or implement
> heuristics (based on glyph extents?).

I don't have a strong opinion either way -- at least not yet, until we 
hear demands from users!

JK