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
readMultiline( dis, design );
				return design;
			}
			case IMAGE_DESIGN :
			{
				ImageItemDesign design = new ImageItemDesign( );
				readImage( dis, design );
				return design;
			}
			case TEMPLATE_DESIGN :
			{
				TemplateDesign design = new TemplateDesign( );
				readTemplate( dis, design );
				return design;
			}
			case EXTENDED_DESIGN :
			{
				ExtendedItemDesign design = new ExtendedItemDesign( );
				readExtended( dis, design );
				return design;
			}
			case AUTO_TEXT_DESIGN :
			{
				AutoTextItemDesign design = new AutoTextItemDesign( );
				readAutoText( dis, design );
				return design;
			}
			default :
				throw new IOException( "unknow design type:" + designType );
		}