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
column.setVisibility( visibility );
				break;
			case FIELD_HAS_DATA_ITEMS_IN_DETAIL :
				boolean hasDataItemsInDetail = IOUtil.readBool( in );
				column.setHasDataItemsInDetail( hasDataItemsInDetail );
				break;
			default :
				readStyledElementField( in, column, fieldType );
		}
	}
	protected void readRow( DataInputStream in, RowDesign row )
			throws IOException
	{
		while ( in.available( ) > 0 )
		{
			short fieldType = IOUtil.readShort( in );
			readRowField( in, row, fieldType );
		}
	}
	protected void readRowField( DataInputStream in, RowDesign row,
			short fieldType ) throws IOException
	{
		switch ( fieldType )
		{
			case FIELD_IS_START_OF_GROUP :
				boolean isStartOfGroup = IOUtil.readBool( in );
				row.setStartOfGroup( isStartOfGroup );
				break;
			default :
				readReportItemField( in, row, fieldType );