ion</em> phase of the request processing
 lifecycle and during the <em>Restore View</em> phase of the
 request processing lifecycle (especially when a new root
 component is created).  In the present version of the
 specification, implementations are not required to enforce this
 restriction, though a future version of the specification may
 require enforcement.</p>

 <p class="changed_added_2_0">If the current
 <code>UIViewRoot</code> is non-<code>null</code>, and calling
 <code>equals()</code> on the argu