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
linkReportElement( band );
			int count = band.getContentCount( );
			for ( int i = 0; i < count; i++ )
			{
				ReportItemDesign item = band.getContent( i );
				item.accept( this, value );
			}
			return value;
		}
		public Object visitCell( CellDesign cell, Object value )
		{
			linkReportElement( cell );
			int count = cell.getContentCount( );
			for ( int i = 0; i < count; i++ )
			{
				ReportItemDesign item = cell.getContent( i );
				item.accept( this, value );
			}
			return value;
		}
		public Object visitFreeFormItem( FreeFormItemDesign container,
				Object value )
		{
			linkReportElement( container );
			int count = container.getItemCount( );
			for ( int i = 0; i < count; i++ )
			{
				ReportItemDesign item = container.getItem( i );
				item.accept( this, value );
			}