Bug 141192 [Viewers] Javadoc change about multiple equal elements in StructuredViewer and AbstractTreeViewer
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
* 
     * @param item
     *           the widget
     */
    private void disassociateChildren(Item item) {
        Item[] items = getChildren(item);
        for (int i = 0; i < items.length; i++) {
            if (items[i].getData() != null) {
				disassociate(items[i]);
			}
        }
    }
    
    protected Widget doFindInputItem(Object element) {
        
        Object root = getRoot();
        if (root == null) {
			return null;
		}
        if (equals(root, element)) {
			return getControl();
		}
        return null;
    }
    
    protected Widget doFindItem(Object element) {
        
        Object root = getRoot();
        if (root == null) {
			return null;