Fixed pen strokes' zLevels not being saved to file (Issue #12)

src/adaptors/UBSvgSubsetAdaptor.cpp

@@ -1111,7 +1111,7 @@ bool UBSvgSubsetAdaptor::UBSvgSubsetWriter::persistScene(int pageIndex)
                     if (colorOnDarkBackground.isValid() && colorOnLightBackground.isValid())
                     {
                         mXmlWriter.writeAttribute(UBSettings::uniboardDocumentNamespaceUri, "z-value"
-                                                  , QString("%1").arg(polygonItem->zValue()));
+                                                  , QString("%1").arg(polygonItem->strokesGroup()->zValue()));
 
                         mXmlWriter.writeAttribute(UBSettings::uniboardDocumentNamespaceUri
                                                   , "fill-on-dark-background", colorOnDarkBackground.name());

src/domain/UBGraphicsScene.cpp

@@ -262,6 +262,10 @@ qreal UBZLayerController::changeZLevelTo(QGraphicsItem *item, moveDestination de
     }
 
     //Return new z value assigned to item
+    
+    // experimental
+    item->setZValue(item->data(UBGraphicsItemData::ItemOwnZValue).toReal());
+
     return item->data(UBGraphicsItemData::ItemOwnZValue).toReal();
 }
 

src/domain/UBGraphicsStrokesGroup.cpp

@@ -185,6 +185,7 @@ void UBGraphicsStrokesGroup::copyItemParameters(UBItem *copy) const
         cp->setFlag(QGraphicsItem::ItemIsSelectable, true);
         cp->setData(UBGraphicsItemData::ItemLayerType, this->data(UBGraphicsItemData::ItemLayerType));
         cp->setData(UBGraphicsItemData::ItemLocked, this->data(UBGraphicsItemData::ItemLocked));
+        cp->setZValue(this->zValue());
     }
 }