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
ReportItemDesign item = (ReportItemDesign) readDesign( in );
					cell.addContent( item );
				}
				return cell;
			}
			case LIST_DESIGN :
			{
				ListItemDesign list = new ListItemDesign( );
				readList( dis, list );
				
				if ( IOUtil.readBool( in ) )
				{
					ListBandDesign header = (ListBandDesign) readDesign( in );
					list.setHeader( header );
				}
				
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					ListGroupDesign group = (ListGroupDesign) readDesign( in );
					list.addGroup( group );
				}
				
				if ( IOUtil.readBool( in ) )
				{
					ListBandDesign detail = (ListBandDesign) readDesign( in );
					list.setDetail( detail );
				}
				
				if ( IOUtil.readBool( in ) )