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
listing.setRepeatHeader( repeatHeader );
				break;
			case FIELD_PAGE_BREAK_INTERVAL :
				int pageBreakInterval = IOUtil.readInt( in );
				listing.setPageBreakInterval( pageBreakInterval );
				break;
			default :
				readReportItemField( in, listing, fieldType );
		}
	}
	protected void readGroupField( DataInputStream in, GroupDesign group,
			short fieldType ) throws IOException
	{
		switch ( fieldType )
		{
			case FIELD_GROUP_LEVEL :
				int groupLevel = IOUtil.readInt( in );
				group.setGroupLevel( groupLevel );
				break;
			case FIELD_PAGE_BREAK_BEFORE :
				String pageBreakBefore = IOUtil.readString( in );
				group.setPageBreakBefore( pageBreakBefore );
				break;
			case FIELD_PAGE_BREAK_AFTER :
				String pageBreakAfter = IOUtil.readString( in );
				group.setPageBreakAfter( pageBreakAfter );
				break;
			case FIELD_HEADER_REPEAT :
				boolean hideDetail = IOUtil.readBool( in );
				group.setHideDetail( hideDetail );