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Fix checkbox marks disappearing during PDF flattening - #39

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Julfried wants to merge 12 commits into
jbarrow:mainfrom
Julfried:fix/checkbox-appearance-streams
Open

Fix checkbox marks disappearing during PDF flattening#39
Julfried wants to merge 12 commits into
jbarrow:mainfrom
Julfried:fix/checkbox-appearance-streams

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@Julfried

@Julfried Julfried commented Aug 8, 2026

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  • Add stored /Off and /Yes appearance streams to checkbox widgets.
  • Register appearance streams as indirect Form XObjects with required resources.
  • Add regression coverage for checkbox appearance structure and checked-state flattening.
  • Verify the output manually with StirlingPDF.

This gives flattening tools a stored checkmark appearance to render.

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