Tkinter spinbox test failures on Tk 8.7

[chrstphrchvz]

Tk 8.7 spinboxes allow setting to to an amount less than from, and setting from to an amount greater than to, by swapping the values rather than raising an exception; see https://core.tcl-lang.org/tk/info/841280 . This causes two tests to fail:

======================================================================
FAIL: test_configure_from (test.test_tkinter.test_widgets.SpinboxTest.test_configure_from)
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Traceback (most recent call last):
  File "/Users/user/git/cpython/Lib/test/test_tkinter/test_widgets.py", line 490, in test_configure_from
    self.checkInvalidParam(widget, 'from', 200,
  File "/Users/user/git/cpython/Lib/test/test_tkinter/widget_tests.py", line 60, in checkInvalidParam
    with self.assertRaises(tkinter.TclError) as cm:
AssertionError: TclError not raised

======================================================================
FAIL: test_configure_to (test.test_tkinter.test_widgets.SpinboxTest.test_configure_to)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/user/git/cpython/Lib/test/test_tkinter/test_widgets.py", line 501, in test_configure_to
    self.checkInvalidParam(widget, 'to', -200,
  File "/Users/user/git/cpython/Lib/test/test_tkinter/widget_tests.py", line 60, in checkInvalidParam
    with self.assertRaises(tkinter.TclError) as cm:
AssertionError: TclError not raised

[terryjreedy]

These assertion failures can be fixed by the same mechanism used to fix assertion failures in #104855, and on the same PR.

[serhiy-storchaka]

Fixed by #120824.