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https://issues.apache.org/jira/browse/WICKET-4353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192249#comment-13192249
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Igor Vaynberg commented on WICKET-4353:
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because it did not work when the index of the choice was used instead of an
explicit id.
we should remove the option of using the index in ddcs and everything will work
much better...
> Choice is not rendered as selected on different instances semantically equal
> ----------------------------------------------------------------------------
>
> Key: WICKET-4353
> URL: https://issues.apache.org/jira/browse/WICKET-4353
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.5.4
> Environment: windows, jdk1.6
> Reporter: Per Newgro
> Labels: DropDownChoice
> Attachments: ddcbug.zip
>
>
> With 1.5.4 there was a change in
> org.apache.wicket.markup.html.form.AbstractSingleSelectChoice.java
> Sven stated in list that: "Igor's commit statements says "improved
> inconsistency handling in choice components".
> This change prevents IChoiceRenderer#getIdValue() being called with -1 as the
> index argument. ".
> It is defenitly a comprehensible change. But the effect is (for me) quite
> heavy.
> If you don't overwrite equals in selectable objects then two semantically
> equal instances will not be rendered as
> selected because of the different physical instances. But it worked in 1.5.3.
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