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
return propertyHandle.getChoices( );
	}
	/**
	 * Returns the short display label for this element.
	 * 
	 * @return the display label of this element in SHORT_LABEL level.
	 * @see #getDisplayLabel( int )
	 */
	public String getDisplayLabel( )
	{
		return getDisplayLabel( DesignElement.SHORT_LABEL );
	}
	/**
	 * Returns the display label for this element. The display label is the
	 * localized display name to be shown in the UI. The display label is one of
	 * the following:
	 * <p>
	 * <ul>
	 * <li>The localized display name of this element, if the display name
	 * resource key is set and the localized string is available</li>
	 * <li>The static display name property text of this element, if set</li>
	 * <li>The name of element, if set</li>
	 * <li>The localized display name of this kind of element, which is defined
	 * in metadata, if set</li>
	 * <li>The name of this kind of element, which is also defined in metadata
	 * </li>
	 * </ul>
	 * <p>
	 * The user can also decide at which detail level the display label should
	 * be returned. The level can be one of the following options: