Bug 188029 Top face is missing in Area chart of 2D+ with negative values
Top face is missing in Area chart of 2D+ with negative values. Please see attached screenshot.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/StackedSeriesLookup.java
}
	/**
	 * 
	 * @param cwa
	 * @return
	 * @throws UndefinedValueException
	 * @throws UnexpectedInputException
	 */
	static final StackedSeriesLookup create( ChartWithAxes cwa,
			RunTimeContext rtc ) throws ChartException,
			IllegalArgumentException
	{
		if ( cwa == null ) 
		{
			return null;
		}
		final StackedSeriesLookup ssl = new StackedSeriesLookup( rtc );
		final Axis axBase = cwa.getBaseAxes( )[0];
		final Axis[] axaOrthogonal = cwa.getOrthogonalAxes( axBase, true );
		EList el;
		List alSeries;
		int iSeriesCount;
		StackGroup sg, sgSingle;
		Series se;
		boolean bStackedSet;
		SeriesDefinition sd;
		int iSharedUnitIndex, iSharedUnitCount, iDataSetCount;
		ArrayList alSGCopies;
		DataSetIterator dsi = null;
		for ( int i = 0; i < axaOrthogonal.length; i++ )