cleanup

src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs

@@ -440,13 +440,10 @@ namespace Avalonia.Controls
             }
 
             Debug.Assert(OwningGrid.Parent is InputElement);
-
-            double distanceFromLeft = mousePosition.X;
-            double distanceFromRight = Bounds.Width - distanceFromLeft;
-
+            
             OnMouseMove_Resize(ref handled, mousePositionHeaders);
 
-            OnMouseMove_Reorder(ref handled, mousePosition, mousePositionHeaders, distanceFromLeft, distanceFromRight);
+            OnMouseMove_Reorder(ref handled, mousePosition, mousePositionHeaders);
 
             SetDragCursor(mousePosition);
         }
@@ -716,7 +713,7 @@ namespace Avalonia.Controls
         }
 
         //TODO DragEvents
-        private void OnMouseMove_Reorder(ref bool handled, Point mousePosition, Point mousePositionHeaders, double distanceFromLeft, double distanceFromRight)
+        private void OnMouseMove_Reorder(ref bool handled, Point mousePosition, Point mousePositionHeaders)
         {
             if (handled)
             {