[issue28097] IDLE: document all key bindings, add menu items for more.

[Cheryl Sabella]

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


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keywords: +patch, patch, patch
pull_requests: +10588, 10589, 10590
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28097>
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