[poppler] Missing fonts on DefaultAppareance of Form fields

[jose.aliste at gmail.com]

Hi list,

There are some PDF's out there (I don't know how common they are, but at
least the IRS tax form of 2008 used to have this) that specify fonts like
/Helv or /HeBo in their DA streams without specifying the corresponding
font in the resources. You will find a proof-of-concept patch, where I
refactor the code we use to force ZapDingbats to  render any of the
standard 14 fonts given by the short refs. So the first question is, Do we
want a feature like this? If so, reviews to make this mergable are most
than welcome.


Greetings

José
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