Display realtime output of a subprocess in a tkinter widget

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Finally I found the solution.
After the window construction, you must add :

frame.pack()
# force drawing of the window
win.update_idletasks()

And then after every line insertion in the widget, you must also force a refresh with the same method only on the widget.

# insert the line in the Text widget
t.insert(tk.END, out)
# force widget to display the end of the text (follow the input)
t.see(tk.END)
# force refresh of the widget to be sure that thing are displayed
t.update_idletasks()

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