[issue30853] IDLE: configdialog -- factor out Tracer subclass

[Cheryl Sabella]

Cheryl Sabella added the comment:

Just as an FYI with blurb, I installed it in the same venv as coverage, so I was able to run it with 3.7.  It's really cool.

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<http://bugs.python.org/issue30853>
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