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https://issues.apache.org/jira/browse/PDFBOX-6085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032454#comment-18032454
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ASF subversion and git services commented on PDFBOX-6085:
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Commit 1929307 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1929307 ]
PDFBOX-6085: check that the correct font version is used
> 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
> Components: FontBox
> Affects Versions: 2.0.35, 3.0.6 PDFBox
> Reporter: Constantine Dokolas
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.36, 3.0.7 PDFBox, 4.0.0
>
> Attachments: PDFBOX-6085-demo.pdf
>
>
> 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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