[poppler] Clarification request: Several link actions in one position

[Oliver Sander]

Dear Leonard,

please allow me to ask about a detail of the PDF spec.  In

   https://bugs.kde.org/show_bug.cgi?id=429635

we have received a pdf document with two link actions in the
very same position.  Unfortunately, the spec doesn't seem
to say what to do in this case.  Treat only the first one?
Treat them all (somehow)?  In this particular case, one of
the actions is practically empty and could be filtered out,
but it is easy to imagine files with more than one nontrivial
link actions in one position.  What should a conforming
reader do?

Thank you for your help!

Best regards,
Oliver

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