Fixed RootNode expansion

Author: dolejska-daniel

Scripts/RootNode.cs

@@ -144,7 +144,7 @@ protected void Expand()
             // bottom left node [-x -y]
             centerOffset.x *= -1f;
             subNodes.Insert(
-                3, !ExpansionRight
+                3, ExpansionRight
                     ? CurrentRootNode
                     : new Node<TItem>(center + centerOffset, subBoundsSize)
             );