[egg-list-box] Fix child_changed update_separator code

[Alexander Larsson <alexl src gnome org>]

commit 7ece2dfcb594c971ec18f819e54c32c6a7759ec8
Author: Alexander Larsson <alexl redhat com>
Date:   Fri May 25 13:06:33 2012 +0200

    Fix child_changed update_separator code
    
    When we move a child, three childrens separators may be affected.
    The moved child, the one after the new position, and the one
    *after* the previous position (as it got a new before).
    
    However, we were looking at the one before the previous location => bug.

 egg-list-box.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/egg-list-box.vala b/egg-list-box.vala
index 373a75f..21d1340 100644
--- a/egg-list-box.vala
+++ b/egg-list-box.vala
@@ -139,7 +139,7 @@ public class Egg.ListBox : Container {
     if (info == null)
       return;
 
-    var prev_next = get_previous_visible (info.iter);
+    var prev_next = get_next_visible (info.iter);
 
     if (sort_func != null) {
       children.sort_changed (info.iter, do_sort);