He has posted the file:
https://drive.google.com/file/d/1BaU6iR4yIQAT-oQxGKFnsiIkLjm54GCE/view?usp=sharing

I can confirm the effect. Adobe shows a smaller font when clicking on it. It also happens when I set the field to a shorter text

        PDDocument doc = Loader.loadPDF(new File("..../unflattened.pdf"));
        PDTextField field = (PDTextField) doc.getDocumentCatalog().getAcroForm().getField("homePsdMunicipality");
        field.setValue("pgqqqqqqqqqqqq");
        doc.save(new File("...../unflattenednew.pdf"));



Tilman

On 28.11.2023 21:38, sahy...@fileaffairs.de wrote:
we'd need the sample PDF and compare with what Acrobat does. But at
certain sizes a clipping might occur as the scaling ends at a certain
size. That's also what Acrobat does.

All that stuff is based on looking at Acrobat generated samples and
trying to reproduce that in PDFBox. There is no detailed documentation
about the layout model as this is not part of the PDF spec.

BR
Maruan

Am Dienstag, dem 28.11.2023 um 21:03 +0100 schrieb Tilman Hausherr:
https://stackoverflow.com/questions/77558220/apache-pdfbox-gray-faint-underscores-2-0-26

I'm wondering if this is a bug or a feature / misunderstanding, that
an
autosize acroform text field may cut off glyphs vertically in some
cases?

Tilman




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