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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8090931ba850 by Terry Jan Reedy in branch '2.7':
Issue 20567: Revise idle_test/README.txt and some tests to match new advice.
https://hg.python.org/cpython/rev/8090931ba850

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