[issue33610] IDLE: Make multiple improvements to CodeContext

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

19. idle.rst doc change
20. What's New for 3.6.6 and 3.7.0
These could be patches on this issue.
21. idlelib/NEWS.txt entries

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33610>
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