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https://issues.apache.org/jira/browse/PDFBOX-3461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417523#comment-15417523
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John Hewson commented on PDFBOX-3461:
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This is definitely something which we should think about in the broader context
of appearance generation and high-level text layout (e.g. multilingual shaping).
> Improve handling of control characters when setting AcroForm field values
> -------------------------------------------------------------------------
>
> Key: PDFBOX-3461
> URL: https://issues.apache.org/jira/browse/PDFBOX-3461
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 2.0.1, 2.0.2, 2.0.3, 2.1.0
> Reporter: Maruan Sahyoun
> Labels: Appearance
>
> When filling AcroForm fields the text supplied to {{setValue}} might contain
> control characters such as {{\n}} {{\r}}, {{\t}} and others which leads to an
> {{ java.lang.IllegalArgumentException}} for most fonts as there is no glyph
> to represent these.
> We could enhance the processing of the string provided to provide proper
> replacements similar to how Adobe Acrobat handles that.
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