Mine

Index: libtovid/metagui/gui.py
===================================================================
--- libtovid/metagui/gui.py (revision 2439)
+++ libtovid/metagui/gui.py (working copy)
@@ -410,6 +410,8 @@
         self.tk.call('namespace', 'import', '::tk::dialog::file::')
         self.tk.call('set', '::tk::dialog::file::showHiddenBtn',  '1')
         self.tk.call('set', '::tk::dialog::file::showHiddenVar',  '0')
+        # handle user closing window with window manager
+        self.protocol("WM_DELETE_WINDOW", lambda:self.confirm_exit(self.apps[0]))

     def run(self):
         """Run the GUI"""