Bug 162181 [Smoke] Can't drag datasource and data set from library to the report
The test build is on eclipse 3.2.1 Step to reproduce: 1. new a library and create datasource and dataset in it 2. new a report 3. drag the datasource and dataset to the outline view or data explorer Actual result: It take no effect. Excepted result: It can work.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/DesignElementDropAdapter.java
/**
	 * Constructor
	 * 
	 * @param viewer
	 */
	public DesignElementDropAdapter( TreeViewer viewer )
	{
		super( viewer );
	}
	/**
	 * @see ViewerDropAdapter#dragOver(DropTargetEvent)
	 * 
	 */
	public void dragOver( DropTargetEvent event )
	{
		super.dragOver( event );
		if ( event.detail == DND.DROP_NONE )
			return;
		if ( !validateTarget( getCurrentTarget( ) )
				|| !validateTarget( getCurrentTarget( ),
						TemplateTransfer.getInstance( ).getTemplate( ) ) )
		{
			event.detail = DND.DROP_NONE;
			if ( Policy.TRACING_DND_DRAG )
			{
				System.out.println( "DND >> Drag over " + event.getSource( ) ); 
			}
		}
	}
	/**