Bug 147676 [regression]Visibility set in the first col will affect the second col
Description: Visibility set in the first col will affect the second col Steps to reproduce: 1. Insert a grid(3*3), insert contents to each cell. 2.Set the first col to hide all in visibility and preview Expected result: Only the first col is hidden. Actual result: The second col is hidden, too. If you set the second col in step2, the third col will disappear.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
{
			apply( headerSlot.get( i ) );
			if ( currentElement != null )
			{
				page.addHeader( (ReportItemDesign) currentElement );
			}
		}
		SlotHandle footerSlot = handle.getPageFooter( );
		for ( int i = 0; i < footerSlot.getCount( ); i++ )
		{
			apply( footerSlot.get( i ) );
			if ( currentElement != null )
			{
				page.addFooter( (ReportItemDesign) currentElement );
			}
		}
		
		currentElement = page;
	}
	public void visitList( ListHandle handle )
	{
		
		ListItemDesign listItem = new ListItemDesign( );
		setupListingItem( listItem, handle );
		
		SlotHandle headerSlot = handle.getHeader( );
		if ( headerSlot.getCount( ) > 0 )
		{
			ListBandDesign header = createListBand( headerSlot );
			header.setBandType( ListBandDesign.BAND_HEADER );