[issue22010] Idle: better management of Shell window output

[Terry J. Reedy]

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

1 is a another issue.  2. was partly taken care of by squeezer.
3 is needed.  SyntaxError is often best handled by editing.
4 is still needed.  Tab replacement will happen with a sidebar.

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versions: +Python 3.10 -Python 3.6, Python 3.7

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