[gtk+/gtk-3-2] notebook: don't leak the action widgets

[Michael Natterer <mitch src gnome org>]

commit 87ebfb19fd9422de1d778396770c02e91e6481e8
Author: Michael Natterer <mitch gimp org>
Date:   Thu Nov 17 00:49:42 2011 +0100

    notebook: don't leak the action widgets
    
    The notebook owns them, so it must destroy them in destroy().
    (cherry picked from commit 4c35d987dfe3b169f0448d5c27e5ebad06f91cab)

 gtk/gtknotebook.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index afc51d3..23e49be 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -1685,6 +1685,18 @@ gtk_notebook_destroy (GtkWidget *widget)
   GtkNotebook *notebook = GTK_NOTEBOOK (widget);
   GtkNotebookPrivate *priv = notebook->priv;
 
+  if (priv->action_widget[GTK_PACK_START])
+    {
+      gtk_widget_unparent (priv->action_widget[GTK_PACK_START]);
+      priv->action_widget[GTK_PACK_START] = NULL;
+    }
+
+  if (priv->action_widget[GTK_PACK_END])
+    {
+      gtk_widget_unparent (priv->action_widget[GTK_PACK_END]);
+      priv->action_widget[GTK_PACK_END] = NULL;
+    }
+
   if (priv->menu)
     gtk_notebook_popup_disable (notebook);