Constantine Dokolas created PDFBOX-6085:
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Summary: 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: 3.0.6 PDFBox, 2.0.35
Reporter: Constantine Dokolas
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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