[gnome-control-center] background: Prevent monitor_pictures_model() running multiple times

[Bastien Nocera <hadess src gnome org>]

commit e1fab88105c1fae31fc89472466e5f3933e3574f
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Jul 18 10:27:44 2014 +0200

    background: Prevent monitor_pictures_model() running multiple times
    
    https://bugzilla.gnome.org/show_bug.cgi?id=689351

 panels/background/cc-background-chooser-dialog.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/panels/background/cc-background-chooser-dialog.c 
b/panels/background/cc-background-chooser-dialog.c
index 79b39a2..ea39899 100644
--- a/panels/background/cc-background-chooser-dialog.c
+++ b/panels/background/cc-background-chooser-dialog.c
@@ -172,6 +172,9 @@ monitor_pictures_model (CcBackgroundChooserDialog *chooser)
 {
   GtkTreeModel *model;
 
+  if (chooser->priv->row_inserted_id != 0)
+    return;
+
   model = GTK_TREE_MODEL (bg_source_get_liststore (BG_SOURCE (chooser->priv->pictures_source)));
 
   chooser->priv->row_inserted_id = g_signal_connect (model, "row-inserted",