[issue20350] Replace tkapp.split() to tkapp.splitlist()

[Terry J. Reedy]

Terry J. Reedy added the comment:

FWIW, patch applies cleanly to 3.6 on Windows and test_idle passes.

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versions: +Python 3.5, Python 3.6 -Python 3.3, Python 3.4

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<http://bugs.python.org/issue20350>
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