Lita Cho added the comment:

!!!!

I think I have a fix!! I made it so that centering works while fixing the 
tearing.

For some reason, in the Turtle API, the adjustScrolls method creates a new 
scroll widget for x and y and deletes the old one. I am not sure why it does it 
this way. I'm sure there is a reason for it though.

For the demo, I overwrote the onResize method so that it centers canvas but 
doesn't instantiate a new scroll widget and throws away the old one, which 
fixes the tearing!

I would love for someone to review the patch. Thanks!

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Added file: http://bugs.python.org/file35878/turtledemo_pane_srcoll_fix.patch

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<http://bugs.python.org/issue21597>
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