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https://issues.apache.org/jira/browse/LUCENE-2643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922547#action_12922547
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Robert Muir commented on LUCENE-2643:
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+1 to at least removing from 4.0.
> StringHelper#stringDifference is wrong about supplementary chars
> -----------------------------------------------------------------
>
> Key: LUCENE-2643
> URL: https://issues.apache.org/jira/browse/LUCENE-2643
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 3.0, 3.0.1, 3.0.2
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Trivial
> Fix For: 3.0.3, 3.1, 4.0
>
> Attachments: LUCENE-2643.patch, LUCENE-2643.patch
>
>
> StringHelper#stringDifference does not take supplementary characters into
> account. Since this is not used internally at all we should think about
> removing it but I guess since it is not too complex we should just or fix it
> for bwcompat reasons. For released versions we should really fix it since
> folks might use it though. For trunk we could just drop it.
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