[gnome-shell] Fix the amount of fitting elements calculation in the OverflowList

[Siegfried-Angel Gevatter Pujals <sgevatter src gnome org>]

commit 0b801a0d2dcecb77334433a604a26f1f202d10b9
Author: Siegfried-Angel Gevatter Pujals <rainct ubuntu com>
Date:   Sun Aug 2 20:06:32 2009 +0200

    Fix the amount of fitting elements calculation in the OverflowList
    
    Before this in certain conditions (depending on the available
    height) two items could be drawn in the same position. Bug #590278.

 src/shell-overflow-list.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/shell-overflow-list.c b/src/shell-overflow-list.c
index 8565a33..77da1ad 100644
--- a/src/shell-overflow-list.c
+++ b/src/shell-overflow-list.c
@@ -147,6 +147,9 @@ shell_overflow_list_allocate (ClutterActor           *actor,
       ClutterActor *actor = CLUTTER_ACTOR (iter->data);
       ClutterActorBox child_box;
 
+      if (iter != children)
+        curheight += priv->spacing;
+
       if ((curheight + priv->item_height) > avail_height)
         {
           overflow = TRUE;
@@ -163,8 +166,6 @@ shell_overflow_list_allocate (ClutterActor           *actor,
       clutter_actor_allocate (actor, &child_box, flags);
 
       curheight += priv->item_height;
-      if (iter != children)
-        curheight += priv->spacing;
     }
 
   priv->items_per_page = n_fits;