Add automatic preserving of basic joint properties when converting between types in Editor

Source/Editor/SceneGraph/Actors/JointNode.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using FlaxEngine;
+
+namespace FlaxEditor.SceneGraph.Actors
+{
+    /// <summary>
+    /// Scene tree node for <see cref="Joint"/> actor type.
+    /// </summary>
+    [HideInEditor]
+    public sealed class JointNode : ActorNode
+    {
+        /// <inheritdoc />
+        public JointNode(Actor actor)
+        : base(actor)
+        {
+        }
+
+        /// <inheritdoc />
+        public override void PostConvert(ActorNode source)
+        {
+            base.PostConvert(source);
+
+            if (source.Actor is Joint other)
+            {
+                // Preserve basic properties when changing joint type
+                var joint = (Joint)Actor;
+                joint.Target = other.Target;
+                joint.TargetAnchor = other.TargetAnchor;
+                joint.TargetAnchorRotation = other.TargetAnchorRotation;
+                joint.EnableCollision = other.EnableCollision;
+            }
+        }
+    }
+}