fixing indentation

examples/drag-and-drop/drag-and-drop-2.rkt

@@ -31,7 +31,7 @@
   new-world)
 
 
-
+;; Helper: produces the width and height of the element with the given id.
 (define (width-and-height v element-id)
   (define focused (view-focus v element-id))
   (values (view-width focused)
@@ -126,4 +126,3 @@
 (big-bang (make-world (list) #f)
           (initial-view the-view)
           (to-draw draw))
-