[issue21477] Idle: improve idle_test.htest

[Terry J. Reedy]

Terry J. Reedy added the comment:

Ned, this patch includes a call to macosxSupport. _initializeTkVariantTests(root) in htest.run. Does this work on mac or is something else needed (like doing the same for individual tests that create another root)?

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<http://bugs.python.org/issue21477>
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