[issue21477] Idle: improve idle_test.htest

[Ned Deily]

Ned Deily added the comment:

"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)?"

That looks good and, in a quick spot check running a few tests, seems to work fine.

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