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From "Michael Klink (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4471) Different fields look alike if they have the same /AP/N before value change
Date Mon, 25 Feb 2019 11:31:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16776775#comment-16776775
] 

Michael Klink commented on PDFBOX-4471:
---------------------------------------

Ah, I see your spec quote is missing a bit of context, the paragraph it is in starts with


{quote}
To update an existing appearance stream to reflect a new field value,...
{quote}

This can be interpreted to imply that one has determined before that _updating_ an _existing_
appearance stream in the case at hand is the appropriate measure _to reflect a new field value_.
One might have determined this by actually verifying that the appearance stream in question
is only referenced by annotations that have to be updated in the same way. Or one might have
determined this by knowing that one oneself has created the stream and no tool had the chance
in the time between to re-use the appearance.

I don't want to say that the author of that paragraph has considered this option, merely the
wording is open to this interpretation.

<sarcasm on>Isn't it great to work on the base of a specification which at heart still
is a non-normative reference...<sarcasm off>

> 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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