Bug 134216 [regression] add a report item to library does not work properly
steps to reproduce: - create a library - add report items, say label - add 1st label - add 2nd laebl expected behavior: - everytime i drag a label to Outline->ReportItems, the label will be added actual behavior: - for the 1st label, it worked out fine - for the 2nd label, i had to drag a label twice to complete the operation note that this happened with other report items as well
UI/org.eclipse.birt.report.designer.ui.lib/src/org/eclipse/birt/report/designer/internal/lib/editparts/LibraryReportDesignEditPart.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.editparts.ReportDesignEditPart#deactivate()
	 */
	public void deactivate( )
	{
		HandleAdapterFactory.getInstance( )
				.getLibraryHandleAdapter( getModel( ) )
				.removePropertyChangeListener( this );
		super.deactivate( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
	 */
	public void propertyChange( final PropertyChangeEvent evt )
	{
		if ( evt.getPropertyName( ).equals( LibraryHandleAdapter.CURRENTMODEL ) )
		{
			refresh( );
			Display.getCurrent( ).asyncExec( new Runnable( ) {
				public void run( )
				{
					Object model = evt.getNewValue( );
					Object editpart = getViewer( ).getEditPartRegistry( )
							.get( model );
					if ( editpart instanceof EditPart )
					{