[anjuta] anjuta-tabber: don't iterate list to check if node is first/last

[Carl-Anton Ingmarsson <carlantoni src gnome org>]

commit b125900140e69cb046da8c3b45872e3046ed6e0e
Author: Carl-Anton Ingmarsson <ca ingmarsson gmail com>
Date:   Fri Apr 12 02:57:01 2013 +0200

    anjuta-tabber: don't iterate list to check if node is first/last
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697923

 libanjuta/anjuta-tabber.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libanjuta/anjuta-tabber.c b/libanjuta/anjuta-tabber.c
index 8c43229..85020a9 100644
--- a/libanjuta/anjuta-tabber.c
+++ b/libanjuta/anjuta-tabber.c
@@ -460,9 +460,9 @@ anjuta_tabber_size_allocate(GtkWidget* widget, GtkAllocation* allocation)
                        gtk_style_context_get_padding (context, state, &tab_padding);
                        gtk_style_context_restore (context);
 
-                       if (child == g_list_first (tabber->priv->children))
+                       if (child->prev == NULL)
                                begin_tab += tab_overlap;
-                       if (child == g_list_last (tabber->priv->children))
+                       if (child->next == NULL)
                                end_tab += tab_overlap;
                        
                        gtk_widget_get_preferred_width (child_widget, &minimal,