[issue21868] Tbuffer in turtle allows negative size

[Lita Cho]

Lita Cho added the comment:

Here is a patch for this bug. Basically, when a user gives 0 and below, it doesn't create a TBuffer. Then "undo" does the right thing.

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keywords: +patch
Added file: http://bugs.python.org/file35778/undobuffer_fix.patch

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<http://bugs.python.org/issue21868>
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