[issue28572] IDLE: add tests for config dialog.

[Roundup Robot]

Roundup Robot added the comment:

New changeset f604b6ebd802 by Terry Jan Reedy in branch '3.6':
Issue #28572: Use system-specific values for configdialog font test
https://hg.python.org/cpython/rev/f604b6ebd802

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28572>
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