[HarfBuzz] Auto Fractions vs VULGAR FRACTION characters

[James Cloos]

Try rendering 1⅖ with hb-view.

With a numr/dnom font I get the same as 12⁄5, rather than the same as 1​2⁄5,
as I’d expect.

(Note the U+200B ZERO WIDTH SPACE after the 1 in the latter string.)

I’m at 76fff252.

Pango-view also renders that string wrong, though differently wrong.

-JimC
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James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6