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https://issues.apache.org/jira/browse/PDFBOX-3973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16215477#comment-16215477
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Tilman Hausherr commented on PDFBOX-3973:
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I had another look...
1) Nothing is done if OCGs exist in both files, I thought there was a "bad"
merge but no.
2) the good thing is, the elements in {{Root/OCProperties/OCGs}} MUST be
indirect objects. So if we just change the names then it applies to every usage.
3) the real work is the /D tree :-(
> OCG Layers partly lost after merge
> ----------------------------------
>
> Key: PDFBOX-3973
> URL: https://issues.apache.org/jira/browse/PDFBOX-3973
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.7
> Reporter: Tilman Hausherr
> Labels: OCGs
> Attachments: pdf_layer_new-merged.pdf, pdf_layer_new.pdf
>
>
> Merge the attached file with itself and open with Adobe Reader and zoom out
> so that both pages can be seen. The layer UI has an effect on the first page
> but not on the second.
> I suspect that the cause is that in the resource properties, the names (short
> and long) are the same, but the object numbers are different.
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