[HarfBuzz] Wrong GDEF class in timesi.ttf on Win7

[Behdad Esfahbod]

Hi Jonathan,

As you probably know, I changed mark zeroing from BY_UNICODE_LATE to
BY_GDEF_LATE in HarfBuzz.  So far I only got a bug report about Cantarell
breaking, which was fixed in the font's GDEF table.

Today, Dominik and I noticed that Times New Roman Italic on Windows 7 has
wrong GDEF class for ASCII double-quote, and as such, we now zero its advance
width.  The bug is not present in Windows XP or Windows 8 on.  It also happens
to be present on the OpenType Times New Roman Italic on OS X, but that is
superseded by a non-OpenType version of the font.

Even with the broken font, CoreText does not show the bad rendering, whereas,
in my testing, Uniscribe from Windows 7 does.

Given that Windows 7 still has the largest market share across PCs, I feel
like we cannot ignore this.  I assume IE probably does not expose this bug
because they don't process OpenType features for Latin?  Can someone test on
Windows 7?

I'm not sure how to proceed forward.  IIRC we have had also observed one Latin
glyph with wrong GDEF back a few years ago, in Georgia or some other font on
Windows.  That should be in mozilla bug tracker somewhere.

Please discuss!

-- 
behdad
http://behdad.org/