"cmt"><p>a removed piece that will return to its previous state (if exists).</p></dd><dt class="param">state</dt><dd class="cmt"><p>object that holds the current state (if exists) and the new state.</p></dd></dl><dl class="attributes block"><dt>Definition Classes</dt><dd><a href="../Base/Controller.html" name="Base.Controller" id="Base.Controller" class="extype">Controller</a></dd></dl></div></li><li class="indented0 " name="scala.AnyRef#synchronized" group="Ungrouped" fullComment="yes" data-isabs="false" v