[issue21973] Idle should not quit on corrupted user config files

[Terry J. Reedy]

Terry J. Reedy added the comment:

config-xyz.bad?

I have not look at the tests, but they should be relevant, just in need of changing to using mock message boxes from idle_test/mock_tk.py.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21973>
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