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�Historya@�� Implement Idle Shell history mechanism.

store - Store source statement (called from PyShell.resetoutput).
    fetch - Fetch stored statement matching prefix already entered.
    history_next - Bound to <<history-next>> event (default Alt-N).
    history_prev - Bound to <<history-prev>> event (default Alt-P).
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.text - Idle wrapper of tk Text widget, with .bell().
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