[issue30779] IDLE: configdialog -- factor out Changes class

[Cheryl Sabella]

Changes by Cheryl Sabella <chekat2 at gmail.com>:


Added file: http://bugs.python.org/file46984/configdialog_tests_v1.py

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30779>
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