Make custom property names dirty the graph

com.unity.shadergraph/Editor/Data/Graphs/AbstractMaterialGraph.cs

             return displayName;
         }
 
+        public string SanitizePropertyReferenceName(string referenceName)
+        {
+            referenceName = referenceName.Trim();
+            return referenceName;
+        }
+
         public void RemoveShaderProperty(Guid guid)
         {
             var propertyNodes = GetNodes<PropertyNode>().Where(x => x.propertyGuid == guid).ToList();

com.unity.shadergraph/Editor/Drawing/Blackboard/BlackboardFieldPropertyView.cs

             {
                 property.useCustomReferenceName = m_UseCustomReferenceNameToggle.on;
                 m_ReferenceNameField.SetEnabled(property.useCustomReferenceName);
-                m_Graph.ValidateGraph();
+                m_ReferenceNameField.value = property.referenceName;
+                DirtyNodes(ModificationScope.Graph);
-            m_ReferenceNameField.value = property.customReferenceName;
+            m_ReferenceNameField.value = property.referenceName;
+                if (!property.useCustomReferenceName)
+                    return;
+                DirtyNodes(ModificationScope.Graph);
             });
             AddRow("Specify reference name", m_UseCustomReferenceNameToggle);
 
             }
         }
 
-        void DirtyNodes()
+        void DirtyNodes(ModificationScope modificationScope = ModificationScope.Node)
-                node.Dirty(ModificationScope.Node);
+                node.Dirty(modificationScope);
         }
     }
 }