Bug 156969 [regression]Group header repeat doesn't work in Web Viewer.
Description: Group header repeat doesn't work in Web Viewer. Steps to reproduce: 1. New a data source and dataset, drag the dataset to Layout. 2. Add a group. 3. Set page break in the first data item in table detail row. 4. Preview in web viewer&#12290; Expected result: Group header is repeated in each page. Actual result: No group header repeat effect.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/EngineIRReader.java
return value;
		}
		public Object visitGridItem( GridItemDesign grid, Object value )
		{
			linkReportElement( grid );
			int count = grid.getColumnCount( );
			for ( int i = 0; i < count; i++ )
			{
				ColumnDesign column = grid.getColumn( i );
				linkReportElement( column );
			}
			count = grid.getRowCount( );
			for ( int i = 0; i < count; i++ )
			{
				ReportItemDesign item = grid.getRow( i );
				item.accept( this, value );
			}
			return value;
		}
		public Object visitGroup( GroupDesign group, Object value )
		{
			linkReportElement( group );
			BandDesign header = group.getHeader( );
			if ( header != null )
			{
				header.accept( this, value );
			}
			BandDesign footer = group.getFooter( );
			if ( footer != null )
			{