private void resetClientIds(UIComponent component) {
        Iterator<UIComponent> iterator = component.getFacetsAndChildren();
        while(iterator.hasNext()) {
            UIComponent child = iterator.next();
            resetClientIds(child);
            child.setId(child.getId());
        }
    }
<p class="changed_added_2_1">Override the base class method to
take special action if the method is being invoked when {@link
StateManager#IS_BUILDING_INITIAL_STATE} is true
<strong>and</strong> the <code>rowStatePreserved</code>
JavaBeans property for this instance is <code>true</code>.</p>

<p class="changed_modified_2_1">The additional action taken is to
traverse the descendents and save their state without regard to
any particular row value.</p>

@since 2.1
primefaces/src/main/java/org/primefaces/component/patch/UIDataPatch.java