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
* @see ViewerDropAdapter#performDrop(Object)
	 */
	public boolean performDrop( Object data )
	{
		if ( data instanceof Object[]
				&& ( (Object[]) data )[0] instanceof ThemeHandle )
		{
			if ( getCurrentTarget( ) instanceof ModuleHandle )
			{
				if ( Policy.TRACING_DND_DRAG )
				{
					System.out.println( "DND >> Dropped. Operation: Apply Theme, Target: " 
							+ getCurrentTarget( ) );
				}
				return ApplyTheme( (ThemeHandle) ( (Object[]) data )[0],
						(ModuleHandle) getCurrentTarget( ) );
			}
			else
			{
				return false;
			}
		}
		if ( getCurrentOperation( ) == DND.DROP_MOVE )
		{
			if ( Policy.TRACING_DND_DRAG )
			{
				System.out.println( "DND >> Dropped. Operation: Copy, Target: " 
						+ getCurrentTarget( ) );
			}
			return moveData( data, getCurrentTarget( ) );