[gnome-control-center] Fix possible crasher when theme changes

[Bastien Nocera <hadess src gnome org>]

commit b8e36d565815441e75ecb41234740be6bc66b7ef
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jul 22 15:56:26 2010 +0100

    Fix possible crasher when theme changes
    
    When the theme or screen changes, we need to make sure that
    the previous handler for the theme-changed signal is disconnected
    to avoid the callback being called when the panel has been unloaded.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=610289

 .../cc-default-applications-panel.c                |    7 +++++++
 panels/default-applications/gnome-da-capplet.c     |    2 +-
 panels/default-applications/gnome-da-capplet.h     |    2 ++
 3 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/panels/default-applications/cc-default-applications-panel.c b/panels/default-applications/cc-default-applications-panel.c
index fc077e8..88d5175 100644
--- a/panels/default-applications/cc-default-applications-panel.c
+++ b/panels/default-applications/cc-default-applications-panel.c
@@ -72,6 +72,13 @@ cc_default_applications_panel_dispose (GObject *object)
       g_object_unref (priv->capplet->gconf);
       gnome_da_xml_free (priv->capplet);
 
+      if (priv->capplet->theme_changed_id > 0)
+        {
+          g_signal_handler_disconnect (priv->capplet->icon_theme,
+                                       priv->capplet->theme_changed_id);
+          priv->capplet->theme_changed_id = 0;
+        }
+
       priv->capplet = NULL;
     }
 
diff --git a/panels/default-applications/gnome-da-capplet.c b/panels/default-applications/gnome-da-capplet.c
index d7682bc..c77b8af 100644
--- a/panels/default-applications/gnome-da-capplet.c
+++ b/panels/default-applications/gnome-da-capplet.c
@@ -286,7 +286,7 @@ screen_changed_cb (GtkWidget *widget, GdkScreen *screen, GnomeDACapplet *capplet
     if (capplet->icon_theme != NULL) {
 	g_signal_handlers_disconnect_by_func (capplet->icon_theme, theme_changed_cb, capplet);
     }
-    g_signal_connect (theme, "changed", G_CALLBACK (theme_changed_cb), capplet);
+    capplet->theme_changed_id = g_signal_connect (theme, "changed", G_CALLBACK (theme_changed_cb), capplet);
     theme_changed_cb (theme, capplet);
 
     capplet->icon_theme = theme;
diff --git a/panels/default-applications/gnome-da-capplet.h b/panels/default-applications/gnome-da-capplet.h
index c4ebea8..a404d8d 100644
--- a/panels/default-applications/gnome-da-capplet.h
+++ b/panels/default-applications/gnome-da-capplet.h
@@ -121,6 +121,8 @@ struct _GnomeDACapplet {
     GList *media_players;
     GList *visual_ats;
     GList *mobility_ats;
+
+    guint theme_changed_id;
 };
 
 void gnome_default_applications_panel_init (GnomeDACapplet *capplet);