[issue21868] Tbuffer in turtle allows negative size

[Lita Cho]

Lita Cho added the comment:

I should clarify. The right thing being that calling undo does nothing, and turtle keeps on running. This is the default behaviour when setundobuffer is called with no size.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21868>
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