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This property determines if the NeedAppearances flag in the PDF
is set when field values are changed.
The NeedAppearances flag signals to the viewing application that
field appearances should be automatically generated rather than
using the appearance embedded in the PDF.
It is generally best to allow the viewing application to generate
its own appearances and use the pre-generated ones as a fallback.
It is unlikely you will want to change the value of this property.
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