[issue21597] Allow turtledemo code pane to get wider.

[Lita Cho]

Changes by Lita Cho <lita.cho at gmail.com>:


Added file: http://bugs.python.org/file35890/turtledemo_pane_scroll_SOLID.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21597>
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