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
int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					RowDesign row = (RowDesign) readDesign( in );
					band.addContent( row );
				}
				return band;
			}
			case LABEL_DESIGN :
			{
				LabelItemDesign design = new LabelItemDesign( );
				readLabel( dis, design );
				return design;
			}
			case TEXT_DESIGN :
			{
				TextItemDesign design = new TextItemDesign( );
				readText( dis, design );
				return design;
			}
			case DATA_DESIGN :
			{
				DataItemDesign design = new DataItemDesign( );
				readData( dis, design );
				return design;
			}
			case MULTI_LINE_DESIGN :
			{
				MultiLineItemDesign design = new MultiLineItemDesign( );