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

[Terry J. Reedy]

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


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dependencies: +IDLE: Add tests for configdialog highlight tab, IDLE: Add tests for configdialog keys tab, IDLE: Add tests for help sources on configdialog general tab

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