AMD64 Windows8.1 Refleaks 2.7:

https://buildbot.python.org/all/#/builders/33/builds/538

Previous related issues:

* bpo-8445
* bpo-11925

Extract of the test code:

    def test_traversal(self):
        self.nb.pack()
        self.nb.wait_visibility()

        self.nb.select(0)

        simulate_mouse_click(self.nb, 5, 5)
        self.nb.focus_force()
        self.nb.event_generate('<Control-Tab>')
        self.assertEqual(self.nb.select(), str(self.child2))  # <~~~ HERE
        self.nb.focus_force()
        self.nb.event_generate('<Shift-Control-Tab>')
        self.assertEqual(self.nb.select(), str(self.child1))
        ...


Buildbot logs:

test_traversal (test_ttk.test_widgets.NotebookTest) ... ok
test_traversal (test_ttk.test_widgets.NotebookTest) ... FAIL
...
test_xscrollcommand (test_ttk.test_widgets.TreeviewTest) ... ok
test_yscrollcommand (test_ttk.test_widgets.TreeviewTest) ... ok
test_identify (test_ttk.test_widgets.WidgetTest) ... ok
beginning 6 repetitions
123456
.test test_ttk_guionly failed -- Traceback (most recent call last):
  File "D:\buildarea\2.7.ware-win81-release.refleak\build\lib\lib-tk\test\test_ttk\test_widgets.py", line 1096, in test_traversal
    self.assertEqual(self.nb.select(), str(self.child2))
AssertionError: '.85131176L' != '.85291096L'

test_widget_state (test_ttk.test_widgets.WidgetTest) ... ok

======================================================================
FAIL: test_traversal (test_ttk.test_widgets.NotebookTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\buildarea\2.7.ware-win81-release.refleak\build\lib\lib-tk\test\test_ttk\test_widgets.py", line 1096, in test_traversal
    self.assertEqual(self.nb.select(), str(self.child2))
AssertionError: '.85131176L' != '.85291096L'

----------------------------------------------------------------------
Ran 273 tests in 2.843s

FAILED (failures=1)
1 test failed again:
    test_ttk_guionly