Add INodeModificationListener which allows control views to be notified of node change

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Interfaces/INode.cs

     }
 
     public delegate void OnNodeModified(INode node, ModificationScope scope);
-    public delegate void OnNodeReplaced(INode previous, INode current);
 
     public interface INode
     {

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Controls/IControlAttribute.cs

 using System.Reflection;
 using UnityEngine.Experimental.UIElements;
-using UnityEditor.ShaderGraph;
 
 namespace UnityEditor.ShaderGraph.Drawing.Controls
 {

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Views/MaterialNodeView.cs

             }
 
             UpdatePortInputVisibilities();
+
+            foreach (var control in m_ControlViews)
+            {
+                var listener = control as INodeModificationListener;
+                if (listener != null)
+                    listener.OnNodeModified(scope);
+            }
         }
 
         void AddSlots(IEnumerable<MaterialSlot> slots)

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/INodeModificationListener.cs

+using UnityEditor.Graphing;
+
+namespace UnityEditor.ShaderGraph.Drawing
+{
+    public interface INodeModificationListener
+    {
+        void OnNodeModified(ModificationScope scope);
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/INodeModificationListener.cs.meta

+fileFormatVersion: 2
+guid: 22f268830a014848b3a8bfdd5142a2d0
+timeCreated: 1510751718