[issue31287] IDLE configdialog tests: don't modify tkinter.messagebox.

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31287>
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