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https://issues.apache.org/jira/browse/WICKET-2550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Vaynberg resolved WICKET-2550.
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    Resolution: Won't Fix
      Assignee: Igor Vaynberg

in wicket ajax actions do not alter browser history (the url doesnt change when 
"show data" button is pressed) and so the back button is not always 
deterministic. if a component is added to the page that alter's the pages' last 
modified value the browser may re-request the page and because the ajax action 
does not have its own url the page is reverted to its original state. in other 
words same would happen if you pressed the refresh button in the browser after 
pressing the "show data" button.

> DatePicker introduces a bug regarding the back button support of the browser.
> -----------------------------------------------------------------------------
>
>                 Key: WICKET-2550
>                 URL: https://issues.apache.org/jira/browse/WICKET-2550
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket, wicket-extensions
>    Affects Versions: 1.4.1, 1.4.2, 1.4.3
>            Reporter: Martín Bigio
>            Assignee: Igor Vaynberg
>             Fix For: 1.4.4
>
>         Attachments: QuickStart.zip
>
>
> The attached QuickStart reproduces the bug that the DatePicker behavior 
> introduces.
> 1) Click the "show data" ajax button.
> 2) Click the submit non ajax button.
> 3) Click the back button of the browser.
> As you can see the displayed page doesn't contain the list of strings that 
> appeared in step 1!. If you remove the DatePicker behavior from the TextField 
> and repeat the same process, it works as expected.

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