[issue7001] turtle.py bug-fixes, backported from 3.1 [issue5923]

[Gregor Lingl]

Gregor Lingl <gregorlingl at users.sourceforge.net> added the comment:

!! This patch should be applied if and only if the corresponding one of
turtle.py is applied !!

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nosy: +georg.brandl, loewis
Added file: http://bugs.python.org/file14977/turtleDemo_262_263.diff

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