Bug 162365 [Regression]Can't drag any item from library to another library
Description: Can't drag any item from library to another library Step to reproduce: 1. new a library and insert several items in it 2. new another one 3. drag the items form first library to the second Actual result: Can't drag.
UI/org.eclipse.birt.report.designer.ui.lib/src/org/eclipse/birt/report/designer/internal/lib/views/outline/LibraryOutlinePage.java
}
	protected void addDragAndDropListener()
	{
		
		int ops = DND.DROP_MOVE | DND.DROP_COPY;
		Transfer[] transfers = new Transfer[]{
			TemplateTransfer.getInstance( )
		};
		getTreeViewer( ).addDragSupport( ops,
				transfers,
				new DesignerDragListener( getTreeViewer( ) ) );
		transfers = new Transfer[]{
			TemplateTransfer.getInstance( )
		};
		
		DesignerDropListener dropListener = new LibraryDropListener( getTreeViewer( ) );
		
		dropListener.addDropConstraint( CascadingParameterGroupHandle.class,
				new IDropConstraint( ) {
					public int validate( Object transfer, Object target )
					{
						return RESULT_NO;
					}
				} );
		
		dropListener.addDropConstraint( ScalarParameterHandle.class, new IDropConstraint( ) {
			public int validate( Object transfer, Object target )
			{
				if(target instanceof ScalarParameterHandle)
				{