Reads a form field's additional-actions dictionary (its AA entry, PDF 1.3).
public PdfFieldAdditionalActions? GetFieldAdditionalActions(CosObject? value, CosReference? ownerReference = null)
The AA dictionary, or a reference to it.
The field, for diagnostics when the dictionary is direct.
null when absent, or, with an AdditionalActionsInvalid diagnostic, not a dictionary.ISO 32000-2 §12.6.3, Table 199. The field's own entry: AA is not inheritable (§12.7.4.1, Table 226).