[gnome-shell] Avoid warnings on null actors for tray icons

[Giovanni Campagna <gcampagna src gnome org>]

commit bc22109130c44799c9c4120ee737a17bd28684a3
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sun Oct 24 14:26:50 2010 +0200

    Avoid warnings on null actors for tray icons
    
    Plugging the GtkSocket icon can fail, in which case NaTrayManager emits
    tray-icon-removed but the icon has never emitted plug-added, thus the
    ShellTrayIcon has not been created. This results in various criticals
    and exceptions in the tray-icon-removed handler.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=633028

 src/shell-tray-manager.c   |   22 +++++++++++++++-------
 src/tray/na-tray-manager.c |    2 +-
 2 files changed, 16 insertions(+), 8 deletions(-)
---
diff --git a/src/shell-tray-manager.c b/src/shell-tray-manager.c
index ada5f4c..37368da 100644
--- a/src/shell-tray-manager.c
+++ b/src/shell-tray-manager.c
@@ -60,11 +60,13 @@ free_tray_icon (gpointer data)
 {
   ShellTrayManagerChild *child = data;
 
-  gtk_widget_hide (child->window);
   gtk_widget_destroy (child->window);
-  g_signal_handlers_disconnect_matched (child->actor, G_SIGNAL_MATCH_DATA,
-                                        0, 0, NULL, NULL, child);
-  g_object_unref (child->actor);
+  if (child->actor)
+    {
+      g_signal_handlers_disconnect_matched (child->actor, G_SIGNAL_MATCH_DATA,
+                                            0, 0, NULL, NULL, child);
+      g_object_unref (child->actor);
+    }
   g_slice_free (ShellTrayManagerChild, child);
 }
 
@@ -314,8 +316,14 @@ na_tray_icon_removed (NaTrayManager *na_manager, GtkWidget *socket,
   child = g_hash_table_lookup (manager->priv->icons, socket);
   g_return_if_fail (child != NULL);
 
-  g_signal_emit (manager,
-                 shell_tray_manager_signals[TRAY_ICON_REMOVED], 0,
-                 child->actor);
+  if (child->actor != NULL)
+    {
+      /* Only emit signal if a corresponding tray-icon-added signal was emitted,
+         that is, if embedding did not fail and we got a plug-added
+      */
+      g_signal_emit (manager,
+                     shell_tray_manager_signals[TRAY_ICON_REMOVED], 0,
+                     child->actor);
+    }
   g_hash_table_remove (manager->priv->icons, socket);
 }
diff --git a/src/tray/na-tray-manager.c b/src/tray/na-tray-manager.c
index 5a0b3bd..bccda63 100644
--- a/src/tray/na-tray-manager.c
+++ b/src/tray/na-tray-manager.c
@@ -300,8 +300,8 @@ na_tray_manager_handle_dock_request (NaTrayManager       *manager,
   if (!gtk_socket_get_plug_window (GTK_SOCKET (child)))
     {
       /* Embedding failed, we won't get a plug-removed signal */
+      /* This signal destroys the socket */
       g_signal_emit (manager, manager_signals[TRAY_ICON_REMOVED], 0, child);
-      gtk_widget_destroy (child);
       return;
     }