Bug 152560 PDF doesn't display bottom Border in inner group footer properly
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
public void startRow( IRowContent row )
	{
		currentRowID++;
		CellWrapper[] newRowContent = new CellWrapper[columnNumber];
		if ( currentRowID > 0 )
		{
			ArrayList removedDropCells = new ArrayList();
			for ( int i = 0; i < columnNumber; i++ )
			{
				
				if ( currentRowContent[i] != null )
				{
					int rowSpan = currentRowContent[i].rowSpan;
					if ( rowSpan > 0
							&& currentRowID < rowSpan
									+ currentRowContent[i].rowID || rowSpan < 0 )
					{
						
						newRowContent[i] = currentRowContent[i];
					}
					else
					{
						
						newRowContent[i] = null;
						removedDropCells.add(new Integer(i));						
					}
				}
			}
			if(removedDropCells.size( )>0)
			{