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

Lib/idlelib/idle_test/test_configdialog.pyから始め、特にHighPageTest.setUp、tearDownClass、test_set_theme_type、test_theme_source、test_delete_customを確認してください。macOSで報告された失敗を再現し、対応するHighPageの動作を調査してください。これらのテストがメソッド属性および予期しない状態に関するエラーなしで完了すれば完了です。