simplify connection

Polyhedron/demo/Polyhedron/MainWindow.cpp

@@ -227,8 +227,9 @@ MainWindow::MainWindow(const QStringList &keywords, bool verbose, QWidget* paren
   connect(scene, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex & )),
           this, SLOT(updateInfo()));
 
-  connect(scene, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex & )),
-          this, SLOT(filterOperations()));
+ connect(scene, &Scene::dataChanged,
+         this, [this]() { filterOperations(false); });
+
 
   connect(scene, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex & )),
           this, SLOT(updateDisplayInfo()));

Polyhedron/demo/Polyhedron/MainWindow.h

@@ -366,7 +366,6 @@ protected Q_SLOTS:
   //!Hides not available operations and show available operations in all the
   //!menus.
   void filterOperations(bool hide);
-  void filterOperations(){ filterOperations(false); };
   //!Updates the bounding box and moves the camera to fits the scene.
   void recenterScene();
   //!Resizes the header of the scene view