Disconnect all GTK signals referencing a wx object which is being destructed

or which is destroying the associated GTK object


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72696 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/msgdlg.cpp

@@ -292,6 +292,7 @@ int wxMessageDialog::ShowModal()
         gtk_window_present( GTK_WINDOW(m_parent->m_widget) );
 
     gint result = gtk_dialog_run(GTK_DIALOG(m_widget));
+    GTKDisconnect(m_widget);
     gtk_widget_destroy(m_widget);
     g_object_unref(m_widget);
     m_widget = NULL;