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https://issues.apache.org/jira/browse/PDFBOX-5565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17684810#comment-17684810
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Maruan Sahyoun commented on PDFBOX-5565:
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note that setNeedAppearances to true signals that there hasn't been an
appearence generated and/or it's oudated ... and the rendering application
should generate one on the fly.
> RFE: Comb flag warning
> ----------------------
>
> Key: PDFBOX-5565
> URL: https://issues.apache.org/jira/browse/PDFBOX-5565
> Project: PDFBox
> Issue Type: Improvement
> Reporter: Jurgen Doll
> Priority: Minor
>
> Currently if a PDF form text field has it's Comb flag set true but the max
> length hasn't been set then PDFBox silently ignores the field and doesn't
> render it.
> It would be helpful for PDFBox to at least issue a warning that the field
> cannot be rendered as a Comb due to this.
> It may be worth noting that if pdForm.setNeedAppearances is set true, and
> after setting fields pdForm.refreshAppearances() is invoked that Comb fields
> without max length specified do display in Acrobat and Edge. However without
> both of these conditions they also don't display, just like PDFBox currently.
> Perhaps worth considering aligning PDFBox to behave in a similar fashion
> then, and to still issue the warning.
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