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
alSGCopies.add( sg );
									}
									bStackedSet = true;
									ssl.htSeriesToStackGroup.put( se, sg );
									sg.addSeries( se ); 
									
								}
								else
								{
									if ( k > 0 && bStackedSet )
									{
										throw new IllegalArgumentException( MessageFormat.format( Messages.getResourceBundle( 
												rtc.getULocale( ) )
												.getString( "exception.stacked.unstacked.mix.series" ),  
												new Object[]{
													sd
												} )
										);
									}
									sg = new StackGroup( -1 ); 
									
									
									alSGCopies.add( sg );
									ssl.htSeriesToStackGroup.put( se, sg );
									sg.addSeries( se ); 
									
								}
							}