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https://issues.apache.org/jira/browse/PDFBOX-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706957#comment-17706957
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Michael Klink commented on PDFBOX-5583:
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{quote}I have included an example file where the field named
`incrementalChangeField` goes from `NotoSans-Regular` to `NotoSansCJK-Regular`
during the incremental change, but the font resource does not get added.{quote}
Indeed, the font resources of that field do not change. Most likely you forgot
a {{setNeedToBeUpdated}} somewhere. You say you _have also tried to mark the
document's PDResource as `setNeedToBeUpdated(true)` but to no avail._ It does
not suffice to mark the overall *Resources* dictionary as changed, you also
have to mark the dictionaries therein, in particular the value of *Font*.
> Adding font (or changing font subset) not coming through in saveIncremental
> ---------------------------------------------------------------------------
>
> Key: PDFBOX-5583
> URL: https://issues.apache.org/jira/browse/PDFBOX-5583
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, PDModel, Signing
> Affects Versions: 2.0.24
> Reporter: Chris Newhouse
> Priority: Major
> Attachments: update-after-signature-includes-font-change.pdf
>
>
> In an effort to keep file sizes small, we leverage Font Subsets in our PDFs.
> Also, we already have "incremental change and signing" (where fields are
> changed _after_ a signature, without voiding the prior signature thanks to
> using `saveIncremental` and signing the changes) working just fine in most
> cases.
> However, when the Font on a field is changed or a new Font Subset must be
> added to the document because the characters used in a field with a
> tightly-subsetted Font, things don't work correctly:
> * The signatures stay valid, which is great
> * But the new Font information does not appear to get written to new version
> appendix, so you get nonsense rendering in a PDF viewer since the field still
> points to a Font resource that is either not there or is a subset that does
> not contain all the necessary characters. I'm not super proficient in this so
> I don't know exactly what's going on.
>
> I have ensured that the fields we update are getting marked as
> `setNeedToBeUpdated(true)` (this is, I believe, why the fields changes _do_
> end up in the version changes), it just seems that the Font resources are not
> getting updated in the version.
> I have also tried to mark the document's PDResource as
> `setNeedToBeUpdated(true)` but to no avail.
>
> Is this behavior possible/allowed? Is it a bug or am I doing something wrong?
>
> I have included an example file where the field named
> `incrementalChangeField` goes from `NotoSans-Regular` to
> `NotoSansCJK-Regular` during the incremental change, but the font resource
> does not get added.
> Thanks for your time!
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