[poppler] Wrong annotation border color with acroread-generated appearance

[Fabio D'Urso]

The attached document contains two annotations with acroread-generated 
appearance streams (Adobe Reader 10.1.2 on OS X 10.6).
In particular the AnnotFreeText's appearance stream (7 0 R) starts with:
 1 1 0 rg
 88.3 508.7597 283.8634 41.9518 re
 B
It doesn't set the stroke color before painting.

Since the previous annotation has a yellow border (*), the yellow stroke color 
stays selected and it's used for this annotation too.

But acroread renders a black border instead.

I think that the issue is that appearance streams in general expect some 
default graphic state (eg "0 G"). But I couldn't find any reference to this in 
the specs.

* = Actually, that border should not be drawn. I've got a fix, but it hides 
this bug, therefore it'll have to wait until this issue is solved.
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