Add utility function for calculating hash codes

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Inspector/Views/GraphInspectorView.cs

                 return;
             }
 
-            var presenterHash = 17;
-            unchecked
-            {
-                presenterHash = presenterHash * 31 + (presenter.editor == null ? 79 : presenter.editor.GetHashCode());
-                presenterHash = presenterHash * 31 + presenter.selectionCount;
-            }
+            var presenterHash = UIUtilities.GetHashCode(presenter.editor, presenter.selectionCount);
 
             m_Title.text = presenter.title;
 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Util/UIUtilities.cs

 
             return true;
         }
+
+        public static int GetHashCode(params object[] objects)
+        {
+            var hashCode = 17;
+            foreach (var @object in objects)
+            {
+                hashCode = hashCode * 31 + (@object == null ? 79 : @object.GetHashCode());
+            }
+            return hashCode;
+        }
     }
 }