[issue6699] IDLE: Warn user about overwriting a file that has a newer version on filesystem

[Zackery Spytz]

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


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pull_requests: +17052
pull_request: https://github.com/python/cpython/pull/17578

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<https://bugs.python.org/issue6699>
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