[issue39666] IDLE: Factor out similar code in editor and hyperparser

[Cheryl Sabella]

Change by Cheryl Sabella <cheryl.sabella at gmail.com>:


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keywords: +patch
pull_requests: +17916
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18539

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39666>
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