[issue30780] IDLE: configdialog - add tests for ConfigDialog GUI.

[Terry J. Reedy]

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


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.8, Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30780>
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