Improvements to Widget handling - #5127
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* Improved / streamlined Widget insertion * More complete Widget deletion: We now automatically also remove parent fields when their /Kids arrays become empty. * Inter-field calculation is now handled during widget insertion directly and requires no separate function. * The xref that goes into /AcroForm/CO is no longer the xref of a Widget, but always that of the owning (parent) Form Field. So the previous check that the last item of the /CO array is equal to the last inserted widget yields a wrong result.
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add test script