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https://issues.apache.org/jira/browse/PDFBOX-6085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032002#comment-18032002
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Tilman Hausherr commented on PDFBOX-6085:
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Thank you, I am able to reproduce the problem. It happens with GID 596. For
some reason the content read isn't the same when read in
{{addCompoundReferences()}}. The position isn't the same.
> TTFSubsetter.buildGlyfTable() modifies glyphIds while iterating over its
> entries possibly causing ConcurrentModificationException to be thrown
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-6085
> URL: https://issues.apache.org/jira/browse/PDFBOX-6085
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.35, 3.0.6 PDFBox
> Reporter: Constantine Dokolas
> Priority: Major
>
> Modifying a {{TreeSet}} while iterating over its members is prohibited as it
> may throw a {{ConcurrentModificationException}} if the set is actually
> modified.
> This can be observed during subsetting some fonts, e.g. Devanagari
> (NotoSansDevanagari).
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