[HarfBuzz] Refactoring mark skipping

[Jonathan Kew]

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.

JK

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