Gui: modernize C++: use default member init

src/Gui/DAGView/DAGModelGraph.cpp

@@ -34,13 +34,7 @@ VertexProperty::VertexProperty() :
   visibleIcon(new QGraphicsPixmapItem()),
   stateIcon(new QGraphicsPixmapItem()),
   icon(new QGraphicsPixmapItem()),
-  text(new QGraphicsTextItem()),
-  row(0),
-  column(0),
-  topoSortIndex(0),
-  lastVisibleState(VisibilityState::None),
-  lastFeatureState(FeatureState::None),
-  dagVisible(true)
+  text(new QGraphicsTextItem())
 {
   //set z values.
   this->rectangle->setZValue(-1000.0);
@@ -51,10 +45,7 @@ VertexProperty::VertexProperty() :
   this->text->setZValue(0.0);
 }
 
-EdgeProperty::EdgeProperty() : relation(BranchTag::None)
-{
-
-}
+EdgeProperty::EdgeProperty() = default;
 
 bool Gui::DAG::hasRecord(const App::DocumentObject* dObjectIn, const GraphLinkContainer &containerIn)
 {