[issue27620] IDLE: Add keyboard equivalents for mouse actions.

[Terry J. Reedy]

Terry J. Reedy added the comment:

#27621 is about <Return> invoking [Ok] even when the focus is on [Cancel].

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dependencies: +<Return> incorrectly works in IDLE Query dialogs

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27620>
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