[issue33610] IDLE: Make multiple improvements to CodeContext

[Terry J. Reedy]

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

I2: replace font/hightlight loop with notification and immediate change instead of a delay is a bugfix.

In testing PR 14675 for #37530 I discovered a bug.  'Show' always shows a single blank line, as if the top visible line were the top line of the file.  One should not have to scroll to trigger the context calculation.  This exists now, prior to the new PR. If/when we add a hotkey (M4), once should be able to show, see context, and hide just by hitting hotkey twice.  Add

C3: Make 'Show' show the context for the current top visible line.

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