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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 <> event (default Alt-N).
history_prev - Bound to <> event (default Alt-P).
c C sL || _ g | _d| _d| _tddddd| _|d| j |d| j dS ) ad Initialize data attributes and bind event methods.
.text - Idle wrapper of tk Text widget, with .bell().
.history - source statements, possibly with multiple lines.
.prefix - source already entered at prompt; filters history list.
.pointer - index into history.
.cyclic - wrap around history list (or not).
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Sound bell when return to start line or cannot leave a line
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