simpler patch for removing info with item (r67819).

Revert r70929

Polyhedron/demo/Polyhedron/MainWindow.cpp

@@ -131,7 +131,7 @@ MainWindow::MainWindow(QWidget* parent)
   viewer->setScene(scene);
   sceneView->setModel(scene);
 
-  // setup the treeview: delegation and columns sizing...
+  // setup the sceneview: delegation and columns sizing...
   sceneView->setItemDelegate(new SceneDelegate(this));
 
   sceneView->header()->setStretchLastSection(false);
@@ -151,9 +151,6 @@ MainWindow::MainWindow(QWidget* parent)
   connect(scene, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex & )),
           this, SLOT(updateInfo()));
 
-connect(scene, SIGNAL(itemsDestroyed()),
-          this, SLOT(updateInfo()));
-
   
   connect(scene, SIGNAL(dataChanged(const QModelIndex &, const QModelIndex & )),
           this, SLOT(updateDisplayInfo()));
@@ -791,13 +788,18 @@ Scene_item* MainWindow::load_item(QFileInfo fileinfo, Polyhedron_demo_io_plugin_
 
 void MainWindow::selectSceneItem(int i)
 {
-  if(i < 0) return;
-  if(i >= scene->numberOfEntries()) return;
-
-  sceneView->selectionModel()->select(scene->createSelection(i),
-                                     QItemSelectionModel::ClearAndSelect);
+  if(i < 0 || i >= scene->numberOfEntries()) {
+    sceneView->selectionModel()->clearSelection();
+    updateInfo();
+    updateDisplayInfo();
+  }
+  else {
+    sceneView->selectionModel()->select(scene->createSelection(i),
+                                       QItemSelectionModel::ClearAndSelect);
+  }
 }
 
+
 void MainWindow::showSelectedPoint(double x, double y, double z)
 {
   information(QString("Selected point: (%1, %2, %3)").

Polyhedron/demo/Polyhedron/Scene.cpp

@@ -111,8 +111,6 @@ Scene::erase(QList<int> indices)
   emit updated();
   QAbstractListModel::reset();
 
-  emit itemsDestroyed();
-  
   int index = max_index + 1 - indices.size();
   if(index >= 0)
     return index;

Polyhedron/demo/Polyhedron/Scene.h

@@ -130,7 +130,6 @@ signals:
   void updated_bbox();
   void updated();
   void itemAboutToBeDestroyed(Scene_item*);
-  void itemsDestroyed();
   void selectionRay(double, double, double, double, double, double);
 
 private slots: