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
* <p>
	 * <ul>
	 * <li>USER_LABEL: Only the first 3 steps are used, if not found, return
	 * null</li>
	 * <li>SHORT_LABEL: All the above steps are used. This will ensure there
	 * will be a return value</li>
	 * <li>FULL_LABEL: Besides the return value of SHORT_LABEL, this option
	 * says we need to return additional information. This information is
	 * specific to each kind of element and my include row and column position,
	 * x and y position and so on. To get this, every child element needs to
	 * overwrite this method</li>
	 * </ul>
	 * 
	 * @param level
	 *            the display label detail level
	 * @return the display label of this element in a given level
	 */
	public String getDisplayLabel( int level )
	{
		assert level == DesignElement.USER_LABEL
				|| level == DesignElement.SHORT_LABEL
				|| level == DesignElement.FULL_LABEL;
		return getElement( ).getDisplayLabel( module, level );
	}
	/**
	 * Sorts a list of elements by localized display name.
	 * 
	 * @param list
	 *            the list to sort
	 */