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
* family property, return a <code>FontHandle</code>. Otherwise, return
	 * <code>null</code>.
	 * 
	 * @return a corresponding FontHandle or <code>null</code>.
	 * 
	 * @see FontHandle
	 */
	protected FontHandle getFontProperty( )
	{
		ElementPropertyDefn propDefn = getElement( ).getPropertyDefn(
				Style.FONT_FAMILY_PROP );
		if ( propDefn == null )
			return null;
		return new FontHandle( this );
	}
	/**
	 * Returns the value of an element reference property. Returns a handle to
	 * the referenced element, or <code>null</code> if the reference is
	 * unresolved or unset.
	 * 
	 * @param propName
	 *            the name of the property.
	 * @return a corresponding DesignElement handle to the referenced element
	 */
	public DesignElementHandle getElementProperty( String propName )
	{
		DesignElement target = getElement( ).getReferenceProperty( module,
				propName );
		if ( target == null )
			return null;