[shader graph] Fix issue where we were overriding base class and not calling the function.

UnityProject/Assets/UnityShaderEditor/Editor/Source/MaterialGraphGUI.cs

             else if (m_SelectedGUI == SelectedOptions.options)
                 graph.materialOptions.DoGUI();
 
-            GUILayout.FlexibleSpace();
-            if (GUILayout.Button("Output Shader :)"))
-            {
-                Dictionary<string, Texture> defaultTextures;
-                var shader = ShaderGenerator.GenerateSurfaceShader(graph, graph.name, false, out defaultTextures);
-                graph.UpdateShaderSource(shader, defaultTextures);
-            }
             GUILayout.EndArea();
         }
     }

UnityProject/Assets/UnityShaderEditor/Editor/Source/Nodes/BaseMaterialNode.cs

             hideFlags = HideFlags.HideInHierarchy;
         }
 
-        void OnEnable()
+        public virtual void OnEnable()
         {
             if (m_SlotDefaultValues == null)
             {
             // if it has... do nothing.
             MaterialWindow.DebugMaterialGraph("Node ID: " + GetInstanceID());
             MaterialWindow.DebugMaterialGraph("Node Name: " + GetOutputVariableNameForNode());
+            Debug.Log("Slot name" + (slot != null ? slot.name : "Null"));
-            if (GetSlotDefaultValue(slot.name) == null)
-                SetSlotDefaultValue(slot.name, new SlotDefaultValue(defaultValue, this, slot.name, true));
+            SetSlotDefaultValue(slot.name, new SlotDefaultValue(defaultValue, this, slot.name, true));
 
             var slotthing = GetSlotDefaultValue(slot.name);
             MaterialWindow.DebugMaterialGraph("Slot Thing: " + slotthing.inputName);

UnityProject/Assets/UnityShaderEditor/Editor/Source/Nodes/PixelShaderNode.cs

             get { return 300; }
         }
 
-        public void OnEnable()
+        public override void OnEnable()
+            base.OnEnable();
+
             AddSlot(new Slot(SlotType.InputSlot, kAlbedoSlotName));
             AddSlot(new Slot(SlotType.InputSlot, kNormalSlotName));
             AddSlot(new Slot(SlotType.InputSlot, kSpecularSlotName));
 
         public override bool UpdatePreviewMaterial()
         {
-            var shaderName = "Hidden/PreviewShader/" + name + "_" + Math.Abs(GetInstanceID());;
+            var shaderName = "Hidden/PreviewShader/" + name + "_" + Math.Abs(GetInstanceID());
+/*
+            //For the pixel shader node we also want to update the shader that uses it:
+            defaultTextures.Clear();
+            var shader = ShaderGenerator.GenerateSurfaceShader(pixelGraph.owner, pixelGraph.owner.name, false, out defaultTextures);
+            pixelGraph.owner.UpdateShaderSource(shader, defaultTextures);*/
             return true;
         }
     }