Added possibility to lock the objects rotation while dragging it

When u drag a object via HandDraggable and move your head the rotation of the object changes.
At least in my case I don't want that, it somehow feels unnatural, so I implemented a public flag to prevent this behaivour (lock the rotation of the object).
Also I added a Header and Space for grouping the different rotation modes in the inspector (probably change the text there a bit?)
And I grouped the handling of the rotation modes (upright, towards user, lock orientation)  into an if-else if-else if construct. If nothing applies (when IsRotationLocked == true) the rotation of the object isn't changed at all (my desired behaivour).
Any opinions?

Author: cnspaha

Assets/HoloToolkit/Input/Scripts/Interactions/HandDraggable.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
 using UnityEngine;
@@ -32,12 +32,18 @@ public class HandDraggable : MonoBehaviour,
         [Tooltip("Scale by which hand movement in z is multipled to move the dragged object.")]
         public float DistanceScale = 2f;
 
+        [Header("Rotation Handling (only select one!)")]
         [Tooltip("Should the object be kept upright as it is being dragged?")]
         public bool IsKeepUpright = false;
 
         [Tooltip("Should the object be oriented towards the user as it is being dragged?")]
         public bool IsOrientTowardsUser = true;
 
+        [Tooltip("Should the rotation of the object be locked?")]
+        public bool LockRotation = false;
+
+        [Space(10)]
+
         public bool IsDraggingEnabled = true;
 
         private Camera mainCamera;
@@ -198,7 +204,12 @@ private void UpdateDragging()
             {
                 draggingRotation = Quaternion.LookRotation(HostTransform.position - pivotPosition);
             }
-            else
+            else if (IsKeepUpright)
+            {
+                Quaternion upRotation = Quaternion.FromToRotation(HostTransform.up, Vector3.up);
+                draggingRotation = upRotation * HostTransform.rotation; ;
+            }
+            else if (!IsRotationLocked)
             {
                 Vector3 objForward = mainCamera.transform.TransformDirection(objRefForward); // in world space
                 Vector3 objUp = mainCamera.transform.TransformDirection(objRefUp);   // in world space
@@ -207,13 +218,8 @@ private void UpdateDragging()
 
             // Apply Final Position
             HostTransform.position = draggingPosition + mainCamera.transform.TransformDirection(objRefGrabPoint);
+            // Apply Final Rotation
             HostTransform.rotation = draggingRotation;
-
-            if (IsKeepUpright)
-            {
-                Quaternion upRotation = Quaternion.FromToRotation(HostTransform.up, Vector3.up);
-                HostTransform.rotation = upRotation * HostTransform.rotation;
-            }
         }
 
         /// <summary>