[issue5492] Error on leaving IDLE with quit() or exit() under Linux

[Roger Serwy]

Roger Serwy added the comment:

Terry, the SystemExit traceback from clicking cancel is expected given how Lib/site.py's Quitter first closes sys.stdin and then raises SystemExit. Closing sys.stdin causes the dialog, the raised exception just gets printed.

We could change the behavior such that when IDLE's internals catch SystemExit, then the close dialog appears. This avoids having to rely on closing sys.stdin to signal IDLE to close. See issue17838 for the patch to do just that.

(It looks like #17838, #17585, and this issue are converging.)

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<http://bugs.python.org/issue5492>
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