Fixed a bug causing frequent, unneeded serialization of the entire graph in the graph inspector

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/AbstractGraphInspector.cs

 
         protected List<AbstractNodeInspector> m_Inspectors = new List<AbstractNodeInspector>();
 
-        protected IGraphAsset m_GraphAsset;
+        protected IGraphAsset graphAsset
+        {
+            get { return target as IGraphAsset; }
+        }
 
         protected abstract void AddTypeMappings(Action<Type, Type> map);
 
 
         private void UpdateSelection()
         {
-            if (m_GraphAsset == null)
+            if (graphAsset == null)
-                selectedNodes.value.AddRange(m_GraphAsset.drawingData.selection.Select(m_GraphAsset.graph.GetNodeFromGuid));
+                selectedNodes.value.AddRange(graphAsset.drawingData.selection.Select(graphAsset.graph.GetNodeFromGuid));
                 if (m_SelectedNodes == null || m_Inspectors.Any(i => i.node == null) || !selectedNodes.value.SequenceEqual(m_SelectedNodes))
                     OnSelectionChanged(selectedNodes.value);
             }
 
         public virtual void OnEnable()
         {
-            m_GraphAsset = target as IGraphAsset;
             m_DataMapper.Clear();
             AddTypeMappings(m_DataMapper.AddMapping);
             UpdateSelection();

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/GraphInspectors/MaterialGraphInspector.cs

     {
         private UnityEngine.MaterialGraph.MaterialGraph materialGraph
         {
-            get { return m_GraphAsset.graph as UnityEngine.MaterialGraph.MaterialGraph; }
+            get { return graphAsset.graph as UnityEngine.MaterialGraph.MaterialGraph; }
         }
 
         public override void OnEnable()