[issue31529] IDLE: Add docstrings and tests for editor.py reload functions

[Terry J. Reedy]

Terry J. Reedy added the comment:

A good start, and big enough as it is, for the next big revision project ;-).

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versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31529>
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