boxes: Actually check for rectangle containment

Fixes condition duplicated:

          /* If a contains b, just remove b */
          if (meta_rectangle_contains_rect (a, b))
            {
              delete_me = other;
            }
          /* If b contains a, just remove a */
          else if (meta_rectangle_contains_rect (a, b))
            {
              delete_me = compare;
            }

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/boxes.c b/src/core/boxes.c
index 93f7db44..19dd939e 100644
--- a/src/core/boxes.c
+++ b/src/core/boxes.c
@@ -414,7 +414,7 @@ merge_spanning_rects_in_region (GList *region)
               delete_me = other;
             }
           /* If b contains a, just remove a */
-          else if (meta_rectangle_contains_rect (a, b))
+          else if (meta_rectangle_contains_rect (b, a))
             {
               delete_me = compare;
             }