Fix duplicating array values in Editor

#1959

Source/Editor/Utilities/Utils.cs

@@ -11,7 +11,6 @@ using System.Globalization;
 using System.Collections.Generic;
 using System.IO;
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -20,6 +19,7 @@ using FlaxEditor.GUI.Input;
 using FlaxEditor.GUI.Tree;
 using FlaxEditor.SceneGraph;
 using FlaxEngine;
+using FlaxEngine.Json;
 using FlaxEngine.GUI;
 using FlaxEngine.Utilities;
 using FlaxEditor.Windows;
@@ -203,6 +203,22 @@ namespace FlaxEditor.Utilities
             }
         }
 
+        /// <summary>
+        /// Clones the value. handles non-value types (such as arrays) that need deep value cloning.
+        /// </summary>
+        /// <param name="value">The source value to clone.</param>
+        /// <returns>The duplicated value.</returns>
+        internal static object CloneValue(object value)
+        {
+            // For objects (eg. arrays) we need to clone them to prevent editing default/reference value within editor
+            if (value != null && (!value.GetType().IsValueType || !value.GetType().IsClass))
+            {
+                var json = JsonSerializer.Serialize(value);
+                value = JsonSerializer.Deserialize(json, value.GetType());
+            }
+            return value;
+        }
+
         /// <summary>
         /// The colors for the keyframes used by the curve editor.
         /// </summary>