[issue21597] Allow turtledemo code pane to get wider.

[Ned Deily]

Ned Deily added the comment:

Lita, the movie looks comparable to what I'm seeing but without the background colors and with thin-lined black border rectangles around each of the two frames.

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