test_idle test_configdialog.HighPageTest failing on macOS

Bug report

Saw these failure on a normal macOS 13 runner:

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ERROR: test_set_theme_type (idlelib.idle_test.test_configdialog.HighPageTest.test_set_theme_type)
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Traceback (most recent call last):
  File "/Users/runner/work/cpython/cpython/Lib/idlelib/idle_test/test_configdialog.py", line 295, in setUp
    d.set_highlight_target.called = 0
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'method' object has no attribute 'called' and no __dict__ for setting new attributes

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ERROR: test_theme_source (idlelib.idle_test.test_configdialog.HighPageTest.test_theme_source)
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Traceback (most recent call last):
  File "/Users/runner/work/cpython/cpython/Lib/idlelib/idle_test/test_configdialog.py", line 295, in setUp
    d.set_highlight_target.called = 0
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'method' object has no attribute 'called' and no __dict__ for setting new attributes

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ERROR: tearDownClass (idlelib.idle_test.test_configdialog.HighPageTest)
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Traceback (most recent call last):
  File "/Users/runner/work/cpython/cpython/Lib/idlelib/idle_test/test_configdialog.py", line 284, in tearDownClass
    del d.set_highlight_target, d.set_color_sample
        ^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'HighPage' object has no attribute 'set_highlight_target'. Did you mean: 'highlight_target'?

======================================================================
FAIL: test_delete_custom (idlelib.idle_test.test_configdialog.HighPageTest.test_delete_custom)
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Traceback (most recent call last):
  File "/Users/runner/work/cpython/cpython/Lib/idlelib/idle_test/test_configdialog.py", line 748, in test_delete_custom
    eq(d.custom_theme_on.state(), ())
    ~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Tuples differ: ('background',) != ()

First tuple contains 1 additional elements.
First extra element 0:
'background'

- ('background',)
+ ()

<snip>

Example failed run:
https://github.com/python/cpython/actions/runs/15265517831/job/42930405567

Start with Lib/idlelib/idle_test/test_configdialog.py, especially HighPageTest.setUp, tearDownClass, test_set_theme_type, test_theme_source, and test_delete_custom. Reproduce the reported failures on macOS and inspect the corresponding HighPage behavior; done means these tests complete without the method-attribute and unexpected-state errors.