[issue6143] IDLE - clear and restart the shell window

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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nosy: +ZackerySpytz
nosy_count: 7.0 -> 8.0
pull_requests: +20826
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/21682

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue6143>
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