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.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
if ( slotHandles == null )
		{
			slotHandles = new SlotHandle[slotCount];
			for ( int i = 0; i < slotCount; i++ )
			{
				slotHandles[i] = null;
			}
		}
		if ( slotHandles[slotID] == null )
		{
			slotHandles[slotID] = new SlotHandle( this, slotID );
		}
		return slotHandles[slotID];
	}
	/**
	 * Returns an iterator over the properties of this element. This handle
	 * returns all properties defined on this element, whether or not they are
	 * actually set on this element.
	 * 
	 * @return an iterator over the properties. Each call to
	 *         <code>getNext( )</code> returns an object of type
	 *         {@link PropertyHandle}.
	 * @see PropertyIterator
	 * @see PropertyHandle
	 * @see UserPropertyDefnHandle
	 */
	public Iterator getPropertyIterator( )
	{
		return new PropertyIterator( this );
	}