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Using findleak.py, attached to #30642, modified to always print the filename, I discovered that test_parenmatch also flashes (along with test_searchbase). The leak test runs each test_xyz module 9 times, so is a good way to see flashing.
Adding 'root.withdraw' stops the single flash when running test_parenmatch once. However, it does not stop flashing when running 9 times with -R: refleak test. Flash continues even if class is reduced to
class ParenMatchTest(unittest.TestCase):
 @classmethod
 def setUpClass(cls):
 cls.root = Tk()
 cls.root.withdraw()
 @classmethod
 def tearDownClass(cls):
 cls.root.destroy()
 del cls.root
 def test_dummy(self): pass
This is a puzzle since the same skeleton is in several other files. In fact, at least one, test_autocomplete, does not even have root.withdraw. In any case, I will add it here.