Merging pdfs doesn't merge the acro form fields

[TheSuperBeaver]

Describe the bug Using PdfSmartCopy, i'm trying to merge multiple pdfs into one. The generated pdf seems ok, but the acro fields are not recognized.

To Reproduce

    public static byte[] merge(final byte[]... byteArrays) {
        try {
            ByteArrayOutputStream pdfResult = new ByteArrayOutputStream();
            Document document = new Document();            
            PdfSmartCopy pdfCopy = new PdfSmartCopy(document, pdfResult);
            PdfDictionary pdfDictionary = new PdfDictionary();

            document.open();
            for (byte[] bytez : byteArrays) {
                if (bytez != null) {
                    try (PdfReader originalPdfReader = new PdfReader(bytez)) {
                        originalPdfReader.getNumberOfPages();

                        // Copy pages
                        for (int i = 1; i <= originalPdfReader.getNumberOfPages(); i++) {
                            PdfImportedPage importedPage = pdfCopy.getImportedPage(originalPdfReader, i);
                            pdfCopy.addPage(importedPage);
                        }

                        // Copy acro forms
                        PRAcroForm acroForm = originalPdfReader.getAcroForm();
                        if (acroForm != null) {
                            pdfCopy.getAcroForm().merge(acroForm);
                           // Also tried this : 
                            pdfCopy.copyAcroForm(originalPdfReader);
                        }
                        pdfCopy.flush();
                    }
                }
            }

            document.close();

            return pdfResult.toByteArray();

Expected behavior I expect that the fields are in the final pdf, and recognized as such by reader (like acrobat)

Screenshots

System (please complete the following information):

Additional context

In iText, there is the concept of ".setMergeFields();" that fixes this issue, but it's not in openPdf

[sa-sh]

as i know this utit does not support merging of AcroForm from multiple source documents. consider to use PdfCopyFields or PdfCopyForms utils