bpo-45160: Fix refleak in test_ttk_guionly introduced in pythonGH-28291 (pythonGH-29416)

ambv · miss-islington · commit 291155b922e0 · 2021-11-05T08:51:40.000Z
(cherry picked from commit 54d1e3f) Co-authored-by: Łukasz Langa <lukasz@langa.pl>
diff --git a/Lib/tkinter/test/test_ttk/test_extensions.py b/Lib/tkinter/test/test_ttk/test_extensions.py
@@ -310,9 +310,12 @@ def cb_test(*args):
             self.assertEqual(textvar.get(), items[1])
             success.append(True)
         optmenu = ttk.OptionMenu(self.root, textvar, "a", *items)
-        textvar.trace("w", cb_test)
+        optmenu.pack()
+        cb_name = textvar.trace("w", cb_test)
         optmenu['menu'].invoke(1)
         self.assertEqual(success, [True])
+        textvar.trace_vdelete("w", cb_name)
+        optmenu.destroy()
 
 
 class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
