Prevent bogus event which GTK 2.4 sends after

typing text in the text area begins and the
    text there has no match in the list.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41981 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/combobox.cpp

@@ -190,6 +190,9 @@ gtkcombobox_changed_callback( GtkWidget *WXUNUSED(widget), wxComboBox *combo )
 
     if (!combo->m_hasVMT) return;
 
+    if (combo->GetSelection() == -1)
+        return;
+
     wxCommandEvent event( wxEVT_COMMAND_COMBOBOX_SELECTED, combo->GetId() );
     event.SetInt( combo->GetSelection() );
     event.SetString( combo->GetStringSelection() );