WICKET-5547 javadoc for #equals() and #hashcode()
Fix test expectation.
WICKET-5549 redirect to page if ajax request is not sent by
wicket-ajax.js
[WICKET-5541] unsubscribe components
WICKET-5548 Websocket initialization URL is not valid when filter is not mapped to root.
WICKET-5546 initialize Page before calling into instantiationListeners
use generic parameter for #onSelectionChanged(); added reference
to #wantOnSelectionChangedNotifications in javadoc