[issue33610] IDLE: Make multiple improvements to CodeContext

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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dependencies: +IDLE cond context: fix code update and font update timers, IDLE: Add docstrings and tests for codecontext, Idle Code Context: separate changing current and future editors
stage: test needed -> 
title: IDLE: Improve CodeContext (various issues) -> IDLE: Make multiple improvements to CodeContext
versions: +Python 3.6, Python 3.7, Python 3.8

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