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
cell.setDrop( drop );
				break;
			case FIELD_DISPLAY_GROUP_ICON :
				boolean displayGroupIcon = IOUtil.readBool( in );
				cell.setDisplayGroupIcon( displayGroupIcon );
				break;
			default :
				readReportItemField( in, cell, fieldType );
		}
	}
	protected void readFreeForm( DataInputStream in, FreeFormItemDesign freeForm )
			throws IOException
	{
		while ( in.available( ) > 0 )
		{
			short fieldType = IOUtil.readShort( in );
			readFreeFormField( in, freeForm, fieldType );
		}
	}
	protected void readFreeFormField( DataInputStream in,
			FreeFormItemDesign freeForm, short fieldType ) throws IOException
	{
		readReportItemField( in, freeForm, fieldType );
	}
	protected void readLabel( DataInputStream in, LabelItemDesign label )
			throws IOException
	{
		while ( in.available( ) > 0 )
		{
			short fieldType = IOUtil.readShort( in );