Message 173303 - Python tracker

I've committed Roger's fix for release in 3.3.1 and 3.4.0.  Thanks, Roger.  I did not apply the proposed test since, as it stands, it would never be run by test.regrtest without establishing a idlelib test runner infrastructure as proposed by Issue15392.  I'm attaching the test as a separate patch and will add a comment to 15392 that the test should be added.