Wrong display of nested squares

[ghost]

This is a minimal example of the wrong display

Python 3.6.1, with IDLE on windows 10: it works

import turtle as t

sideLength = 40
for square in range(5):
    for side in range(4):
        t.forward(sideLength)
        t.left(90)
    sideLength += 10

With ipython-turtle-widget in Jupyter notebook() : wrong display

from ipyturtle import Turtle
t = Turtle(fixed=False, width=200, height=200)
t

sideLength = 40
for square in range(5):
    for side in range(4):
        t.forward(sideLength)
        t.left(90)
    sideLength += 10

Why ?

Perhaps a rounding error in the angle of the turtle ? (floating value ?)
I can document this bug, but i can't fix it myself.

Thanks !

[gkvoelkl]

Thanks for documenting.

I will care.

Best regards Gerhard

[gkvoelkl]

fixed