Update tests

src/core/symbology/qgsfillsymbollayer.cpp

@@ -3558,6 +3558,10 @@ void QgsPointPatternFillSymbolLayer::renderPolygon( const QPolygonF &points, con
     _renderPolygon( p, points, rings, context );
   }
 
+  // if invalid parameters, skip out
+  if ( qgsDoubleNear( width, 0 ) || qgsDoubleNear( height, 0 ) || width < 0 || height < 0 )
+    return;
+
   p->save();
 
   QPainterPath path;

tests/src/core/testqgspointpatternfillsymbol.cpp

@@ -161,9 +161,13 @@ void TestQgsPointPatternFillSymbol::pointPatternFillSymbolVector()
   QgsMarkerSymbol *pointSymbol = QgsMarkerSymbol::createSimple( properties );
 
   mPointPatternFill->setSubSymbol( pointSymbol );
+  mPointPatternFill->setDistanceX( 10 );
+  mPointPatternFill->setDistanceY( 10 );
   mMapSettings.setFlag( Qgis::MapSettingsFlag::ForceVectorOutput, true );
   const bool res = imageCheck( "symbol_pointfill_vector" );
   mMapSettings.setFlag( Qgis::MapSettingsFlag::ForceVectorOutput, false );
+  mPointPatternFill->setDistanceX( 15 );
+  mPointPatternFill->setDistanceY( 15 );
   QVERIFY( res );
 
   // also confirm that output is indeed vector!