GitHub user CedricGatay opened a pull request:
https://github.com/apache/wicket/pull/45
WICKET-5246
Removed deprecated code using Wicket.Window.unbeforeUnload
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/CedricGatay/wicket WICKET-5246
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/wicket/pull/45.patch
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