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
*            De's table group
	 * @return engine's table group
	 */
	public void visitTableGroup( TableGroupHandle handle )
	{
		TableGroupDesign tableGroup = new TableGroupDesign( );
		setupGroup( tableGroup, handle );
		SlotHandle headerSlot = handle.getHeader( );
		if ( headerSlot.getCount( ) > 0 )
		{
			TableBandDesign header = createTableBand( handle.getHeader( ) );
			header.setBandType( TableBandDesign.GROUP_HEADER );
			header.setGroup( tableGroup );
			tableGroup.setHeader( header );
			tableGroup.setHeaderRepeat( handle.repeatHeader( ) );
			
			
			String toc = handle.getTocExpression( );
			if ( null != toc && !"".equals( toc.trim( ) ) ) 
			{
				if ( header.getRowCount( ) > 0 )
				{
					RowDesign row = header.getRow( 0 );
					row.setTOC( createExpression( toc ) );
				}
			}
		}
		SlotHandle footerSlot = handle.getFooter( );
		if ( footerSlot.getCount( ) > 0 )
		{