nodeview: implemented workable solution to connecting contexts together to show all

Functional, now we just need to fine tune and optimize it.

app/widget/nodeview/nodeview.h

@@ -138,6 +138,8 @@ private:
 
   void CreateNewEdge(NodeViewItem *output_item);
 
+  NodeViewItem *UpdateNodeItem(Node *node);
+
   class NodeViewAttachNodesToCursor : public UndoCommand
   {
   public:
@@ -232,6 +234,8 @@ private:
 
   bool create_edge_already_exists_;
 
+  QTimer reposition_contexts_timer_;
+
   static const double kMinimumScale;
 
 private slots:
@@ -288,6 +292,8 @@ private slots:
 
   void MoveToScenePoint(const QPointF &pos);
 
+  void RepositionContexts();
+
 };
 
 }