[issue21868] Tbuffer in turtle allows negative size

[Roundup Robot]

Roundup Robot added the comment:

New changeset 02b25ec13c94 by Raymond Hettinger in branch '3.4':
Issue #21868: Prevent turtle crash due to invalid undo buffer size.
http://hg.python.org/cpython/rev/02b25ec13c94

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