[egg-list-box] cache the iter while iterating over the children

[Guillaume Desmottes <gdesmott src gnome org>]

commit 117d9e3c9e79292a4aa112d68604891eef4ad5eb
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Tue May 29 16:04:45 2012 +0200

    cache the iter while iterating over the children
    
    The iter may be destroyed in the callback.

 egg-list-box.vala |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/egg-list-box.vala b/egg-list-box.vala
index 2be33a6..beeaa77 100644
--- a/egg-list-box.vala
+++ b/egg-list-box.vala
@@ -852,8 +852,10 @@ public class Egg.ListBox : Container {
 
   public override void forall_internal (bool include_internals,
 					Gtk.Callback callback) {
-    for (var iter = children.get_begin_iter (); !iter.is_end (); iter = iter.next ()) {
+    var iter = children.get_begin_iter ();
+    while (!iter.is_end ()) {
       unowned ChildInfo child_info = iter.get ();
+      iter = iter.next();
       if (child_info.separator != null && include_internals)
 	callback (child_info.separator);
       callback (child_info.widget);