[gtk+/gtk-3-4] GtkTreeModelFilter: Fix _iter_previous() when iter points at 2nd node

[Kristian Rietveld <kristian src gnome org>]

commit fbe14d2dec72f58f21821764bd0656d1f5a6f76a
Author: Rui Matos <tiagomatos gmail com>
Date:   Sat Jul 14 02:34:26 2012 +0200

    GtkTreeModelFilter: Fix _iter_previous() when iter points at 2nd node
    
    GSequence iterators point at the position between two elements so an
    iterator pointing at the N tree model node is actually between the N-1
    and N sequence elements. This means that asking for the previous
    sequence iterator first and then checking if it is the begin iterator
    would yeld true for an iterator pointing at the 2nd tree model node
    and make us return FALSE mistakenly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679910

 gtk/gtktreemodelfilter.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtktreemodelfilter.c b/gtk/gtktreemodelfilter.c
index 2e7d218..a8ef24b 100644
--- a/gtk/gtktreemodelfilter.c
+++ b/gtk/gtktreemodelfilter.c
@@ -3227,12 +3227,12 @@ gtk_tree_model_filter_iter_previous (GtkTreeModel *model,
 
   elt = iter->user_data2;
 
-  siter = g_sequence_iter_prev (elt->visible_siter);
-  if (g_sequence_iter_is_begin (siter))
+  if (g_sequence_iter_is_begin (elt->visible_siter))
     {
       iter->stamp = 0;
       return FALSE;
     }
+  siter = g_sequence_iter_prev (elt->visible_siter);
 
   iter->user_data2 = GET_ELT (siter);