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https://issues.apache.org/jira/browse/PDFBOX-4430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16740184#comment-16740184
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Michael Klink edited comment on PDFBOX-4430 at 9/27/19 5:45 PM:
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As described in a PS to the [stackoverflow 
answer|https://stackoverflow.com/a/54091766/1729265], further analysis showed 
that an attempt actually is made to add a transformation if necessary, but the 
checks whether or not it's necessary are incorrect (and very weird) and the 
calculation of the transform itself is wrong. (For some example PDFs that code 
might work but for the wrong reasons...)


was (Author: mkl):
As described in a PS to the [stackoverflow 
answer](https://stackoverflow.com/a/54091766/1729265), further analysis showed 
that an attempt actually is made to add a transformation if necessary, but the 
checks whether or not it's necessary are incorrect (and very weird) and the 
calculation of the transform itself is wrong. (For some example PDFs that code 
might work but for the wrong reasons...)

> Missing transformation in flatterning when an XObject is used as appearance 
> of a form field
> -------------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-4430
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4430
>             Project: PDFBox
>          Issue Type: Bug
>          Components: AcroForm
>    Affects Versions: 2.0.13
>            Reporter: Tilman Hausherr
>            Priority: Major
>
> As reported by [~mkl] in Stackoverflow.



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