[issue4117] missing update() in _Screen.setup() of Lib/turtle.py

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

Why are you using update instead of update_idletasks ? 
I'm not talking exactly about this line being added, but this ends up
calling TurtleScreenBase._update which calls self.cv.update(), cv being
a canvas. update_idletasks should be used exactly for performing the
kind of tasks expected here, display update and window layout
calculations, while calling update may also process other events or
pending errors.

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nosy: +gpolo

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