[HarfBuzz] Refactoring mark skipping

[Behdad Esfahbod]

On 01/18/2012 05:01 AM, Jonathan Kew wrote:
> On 18 Jan 2012, at 09:46, Jonathan Kew wrote:
> 
>> Still not quite right, according to my testing in Firefox - it now shapes the Lam of Scheherazade's lam-alef properly, but does not get the correct form for the Alef, because the backward-skipper fails.
>>
>> My proposed fix (with a couple of bonus assertions, to check that we don't move the iterators further than they were initialized for) is attached; please check.
> 
> Please ignore that; this version is better.

Thanks.  Donno what I was thinking :).

I pushed a couple smaller changes too.  I think I'm going to close the book on
this skippy thing now.

behdad