nodeview: fix issues when deleting nodes while dragging

app/widget/nodeview/nodeview.h

@@ -167,6 +167,8 @@ private:
 
   void CollapseItem(NodeViewItem *item);
 
+  void EndEdgeDrag(bool cancel = false);
+
   NodeViewMiniMap *minimap_;
 
   struct AttachedItem {
@@ -248,6 +250,8 @@ private slots:
 
   void LabelSelectedNodes();
 
+  void ItemAboutToBeDeleted(NodeViewItem *item);
+
 };
 
 }