Merge pull request #2377 from StephenHodgson/MRTK-vNEXT-RaycastCameraCleanup

properly cleanup ui raycast camera when we disable input system.

Author: David Kline

Assets/MixedRealityToolkit/InputSystem/MixedRealityInputManager.cs

@@ -166,6 +166,18 @@ public override void Destroy()
         {
             InputDisabled?.Invoke();
 
+            if (FocusProvider.UIRaycastCamera != null)
+            {
+                if (Application.isEditor)
+                {
+                    UnityEngine.Object.DestroyImmediate(FocusProvider.UIRaycastCamera.gameObject);
+                }
+                else
+                {
+                    UnityEngine.Object.Destroy(FocusProvider.UIRaycastCamera.gameObject);
+                }
+            }
+
             if (focusProvider != null)
             {
                 focusProvider.enabled = false;