[issue20567] test_idle causes test_ttk_guionly 'can't invoke "event" command: application has been destroyed' messages from Tk

[Terry J. Reedy]

Terry J. Reedy added the comment:

Because I copied from 2.7, which had not been corrected from what I wrote years ago before we started being more consistent and correct.  Fixed in all 3 versions.

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<http://bugs.python.org/issue20567>
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