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https://issues.apache.org/jira/browse/LUCENE-2643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909253#action_12909253
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Robert Muir commented on LUCENE-2643:
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My vote would be to drop it if we arent using it, its @lucene.internal.
since its unused, its not obvious that its "wrong" (its correct if you want the
first code unit difference)
> 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
>
>
> 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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