Fix calling OnParentChanged in Actor load

Source/Engine/Level/Actor.cpp

@@ -948,11 +948,19 @@ void Actor::Deserialize(DeserializeStream& stream, ISerializeModifier* modifier)
     const auto parent = Scripting::FindObject<Actor>(parentId);
     if (_parent != parent)
     {
-        if (_parent)
-            _parent->Children.RemoveKeepOrder(this);
-        _parent = parent;
-        if (_parent)
-            _parent->Children.Add(this);
+        if (IsDuringPlay())
+        {
+            SetParent(parent, false, false);
+        }
+        else
+        {
+            if (_parent)
+                _parent->Children.RemoveKeepOrder(this);
+            _parent = parent;
+            if (_parent)
+                _parent->Children.Add(this);
+            OnParentChanged();
+        }
     }
     else if (!parent && parentId.IsValid())
     {
@@ -1044,6 +1052,10 @@ void Actor::OnDisable()
     }
 }
 
+void Actor::OnParentChanged()
+{
+}
+
 void Actor::OnTransformChanged()
 {
     ASSERT_LOW_LAYER(!_localTransform.IsNanOrInfinity());

Source/Engine/Level/Actor.h

@@ -918,9 +918,7 @@ public:
     /// <summary>
     /// Called when actor parent gets changed.
     /// </summary>
-    virtual void OnParentChanged()
-    {
-    }
+    virtual void OnParentChanged();
 
     /// <summary>
     /// Called when actor transform gets changed.

Source/Engine/Level/Actors/BoneSocket.cpp

@@ -104,6 +104,9 @@ void BoneSocket::OnParentChanged()
 {
     // Base
     Actor::OnParentChanged();
+    
+    if (!IsDuringPlay())
+        return;
 
     _index = -1;
     UpdateTransformation();

Source/Engine/Level/Actors/BoxBrush.cpp

@@ -272,6 +272,9 @@ void BoxBrush::OnParentChanged()
 {
     // Base
     Actor::OnParentChanged();
+    
+    if (!IsDuringPlay())
+        return;
 
     // Fire event
     OnBrushModified();

Source/Engine/Physics/Joints/Joint.cpp

@@ -295,6 +295,9 @@ void Joint::OnParentChanged()
     // Base
     Actor::OnParentChanged();
 
+    if (!IsDuringPlay())
+        return;
+
     // Check reparenting Joint case
     const auto parent = dynamic_cast<IPhysicsActor*>(GetParent());
     if (parent == nullptr)

Source/Engine/UI/UIControl.cpp

@@ -156,6 +156,9 @@ void UIControl::OnParentChanged()
     // Base
     Actor::OnParentChanged();
 
+    if (!IsDuringPlay())
+        return;
+
     UICONTROL_INVOKE(ParentChanged);
 }