[issue27609] IDLE completions: format, factor, and fix

[Terry J. Reedy]

Terry J. Reedy added the comment:

#30666 Add completion tests
#30667 Revise completion doc
#15786 and additional discussion of completion behavior
Tab in opened box should and usually completes, but sometimes not.  I don't have a consistent example.

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nosy:  -python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27609>
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