implemented saving/loading for groups

app/panel/node/node.cpp

@@ -31,6 +31,7 @@ NodePanel::NodePanel(QWidget *parent) :
   // Connect node view signals to this panel - MAY REMOVE
   connect(node_widget_->view(), &NodeView::NodesSelected, this, &NodePanel::NodesSelected);
   connect(node_widget_->view(), &NodeView::NodesDeselected, this, &NodePanel::NodesDeselected);
+  connect(node_widget_->view(), &NodeView::NodeGroupOpenRequested, this, &NodePanel::NodeGroupOpenRequested);
 
   // Set it as the main widget of this panel
   SetWidgetWithPadding(node_widget_);

app/panel/node/node.h

@@ -40,6 +40,11 @@ public:
     return node_widget_;
   }
 
+  const QVector<Node*> &GetContexts() const
+  {
+    return node_widget_->view()->GetContexts();
+  }
+
   void SetContexts(const QVector<Node*> &nodes)
   {
     node_widget_->SetContexts(nodes);
@@ -109,6 +114,7 @@ public slots:
   void Select(const QVector<Node*>& nodes, bool center_view_on_item)
   {
     node_widget_->view()->Select(nodes, center_view_on_item);
+    this->raise();
   }
 
 signals:
@@ -116,6 +122,8 @@ signals:
 
   void NodesDeselected(const QVector<Node*>& nodes);
 
+  void NodeGroupOpenRequested(NodeGroup *group);
+
 private:
   virtual void Retranslate() override
   {