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https://issues.apache.org/jira/browse/PDFBOX-2918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14663324#comment-14663324
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Maruan Sahyoun commented on PDFBOX-2918:
----------------------------------------

{quote}
Is there any reason why we can't construct appearances each time? It's by far 
the most robust and reliable approach.
{quote}

technically not - I was considering the performance impact generating it 
multiple times with each setter call as it can be a costly operation compared 
to the time for the pure setter call. So I'd rather have the extra method and 
document it (similar to the Adobe PDF Library).

> Allow to refresh an AcroForm field appearance
> ---------------------------------------------
>
>                 Key: PDFBOX-2918
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2918
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: AcroForm
>    Affects Versions: 1.8.10, 2.0.0
>            Reporter: Maruan Sahyoun
>              Labels: Appearance
>
> When a field widgets 'style' is changed such as a border is defined this is 
> not immediately visible as the change is not reflected in the widgets 
> appearance stream.
> There should be a possibility to force a refresh of the fields appearance 
> after such settings have been specified.



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