[jira] [Commented] (PDFBOX-4471) Different fields look alike if they have the same /AP/N before value change

["Maruan Sahyoun (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-4471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775917#comment-16775917 ] 

Maruan Sahyoun commented on PDFBOX-4471:
----------------------------------------

There are currently several reasons for that

a) it's part of the legacy code
b) PDF Spec:
{quote}
The conforming reader shall then replace the existing contents of the appearance stream from /Tx BMC to the matching EMC with the corresponding new contents as shown in Example 1 in "Check Boxes," 12.7.4, “Field Types.” (If the existing appearance stream contains no marked content with tag Tx, the new contents shall be appended to the end of the original stream.)
{quote}


> Different fields look alike if they have the same /AP/N before value change
> ---------------------------------------------------------------------------
>
>                 Key: PDFBOX-4471
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4471
>             Project: PDFBox
>          Issue Type: Bug
>          Components: AcroForm
>    Affects Versions: 2.0.13
>            Reporter: Tilman Hausherr
>            Priority: Major
>         Attachments: csOnePage.pdf
>
>
> See attached SO answer - in the attached file, different fields point to the same /AP/N object. I think this could be fixed by changing {{AppearanceGeneratorHelper.setAppearanceValue()}} by removing the "if" segment in {{if (appearance != null && appearance.isStream())}} and keep the "else" part only.
> I'm wondering why we are reusing the existing appearance stream, is there are use case to this? I ran the tests after making the change and there was a difference but it was invisible.



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