[issue32831] IDLE: Add docstrings and tests for codecontext

[Terry J. Reedy]

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

Because BLOCKOPENERS is sufficiently distant from the changes for this issue, I will add 'async' now, without tests, in #33564.

Some of my comments for this issue are ideas for future changes in codecontext.py.

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