[gnome-shell] IconGrid: don't ask for the children list when the number is enough

[Giovanni Campagna <gcampagna src gnome org>]

commit c1518dc7289560350b8093f22e03189eb4ffdb5a
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Wed Feb 20 17:02:34 2013 +0100

    IconGrid: don't ask for the children list when the number is enough
    
    Clutter keeps the number of children cached, while the list must be
    built every time.

 js/ui/iconGrid.js |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/js/ui/iconGrid.js b/js/ui/iconGrid.js
index e26b6f1..416e659 100644
--- a/js/ui/iconGrid.js
+++ b/js/ui/iconGrid.js
@@ -204,10 +204,10 @@ const IconGrid = new Lang.Class({
             // later we'll allocate as many children as fit the parent
             return;
 
-        let children = this._grid.get_children();
+        let nChildren = this._grid.get_n_children();
         let nColumns = this._colLimit ? Math.min(this._colLimit,
-                                                 children.length)
-                                      : children.length;
+                                                 nChildren)
+                                      : nChildren;
         let totalSpacing = Math.max(0, nColumns - 1) * this._spacing;
         // Kind of a lie, but not really an issue right now.  If
         // we wanted to support some sort of hidden/overflow that would