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
* 
	 * @param newContainer
	 *            the new container element
	 * @param toSlot
	 *            the target slot within the new container
	 * @throws ContentException
	 *             If the element cannot be placed into the target element or
	 *             slot, perhaps because the element is of the wrong type, the
	 *             slot is full, or other error.
	 * @see SlotHandle
	 */
	public void moveTo( DesignElementHandle newContainer, int toSlot )
			throws ContentException
	{
		DesignElement element = getElement( );
		DesignElement oldContainer = element.getContainer( );
		if ( oldContainer == null )
			throw new ContentException( element, -1,
					ContentException.DESIGN_EXCEPTION_HAS_NO_CONTAINER );
		int oldSlot = element.getContainerSlot( );
		assert oldSlot != -1;
		ContentCommand cmd = new ContentCommand( module, oldContainer );
		cmd.move( element, oldSlot, newContainer.getElement( ), toSlot );
	}
	/**
	 * Drops this element from the design. Removes the element from its
	 * container and name space, if any.
	 * <p>
	 * Note: If this element is referenceable, the property referring it will be
	 * set null.