Often an action will return its target (ie "return this"). Currently there is a configuration option (isis.viewer.wicket.redirectEvenIfSameObject) which controls whether, in such a case, to simply update the existing web page (using ajax) or to re-render the page completely. By default ajax is used for a smoother UI.
This ticket is to make this controllable via @ActionLayout. One reason for this is to force a re-rendering of a domain object if its layout is changed, as per