Bug 142928 Item from library is changed to a report design item after revert to report item
Details: Item from library is changed to a report design item after revert to report item. Setp: 1.New a template. 2.Use a libary contain a label. 3.Drop the label from library explorer into layout. 4.Change the label to template item. 5.Revert the template item to report item. Actual result: The label is become a report item, but a item from library. Please see the attach image. Exception result: The lable is revert a item from library.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/DefaultNodeProvider.java
else if ( model instanceof SlotHandle )
		{
			return ( (SlotHandle) model ).getElementHandle( );
		}
		else if ( model instanceof ReportElementHandle )
		{
			ReportElementHandle handle = (ReportElementHandle) model;
			if ( handle instanceof CellHandle
					|| handle.getContainer( ) instanceof CellHandle
					|| handle.getContainer( ) instanceof ParameterGroupHandle
					|| ( handle instanceof RowHandle && handle.getContainer( ) instanceof GridHandle ) )
			{
				return handle.getContainer( );
			}
			if ( handle.getContainerSlotHandle( ) != null )
			{
				return new ReportElementModel( handle.getContainerSlotHandle( ) );
			}
		}
		return null;
	}
	/**
	 * Gets the icon image for the given model.
	 * 
	 * @param model
	 *            the model of the node
	 * 
	 * @return Returns the icon name for the model,or null if no proper one
	 *         available for the given model
	 */