[issue18988] Tab key doesn't work sometimes.

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +kbk, roger.serwy, terry.reedy
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18988>
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