Python 为什么 tkinter 画布矩形的参数disabledwidth不起作用

import tkinter as tk
def disabled():
    canvas.itemconfig(rect, state="disabled")
def normal():
    canvas.itemconfig(rect, state="normal")
root    = tk.Tk()
canvas  = tk.Canvas(root, height=250, width=250)
button1 = tk.Button(root, text="change rectangle to state disabled", command=disabled)
button2 = tk.Button(root, text="change rectangle to state normal"  , command=normal  )
rect = canvas.create_rectangle(40, 40, 180, 180,
                fill           = "red",
                activefill     = "green2",
                activeoutline  = "green3",
                activewidth    = 4,
                disabledfill   = "grey",
                disabledoutline= "grey2",
                disabledwidth  = 4
                )
canvas.grid()
button1.grid()
button2.grid()
root.mainloop()

import tkinter as tk

def disabled():
    canvas.itemconfig(rect, state="disabled", width=4)

def normal():
    canvas.itemconfig(rect, state="normal", width=1)

root    = tk.Tk()
canvas  = tk.Canvas(root, height=250, width=250)
button1 = tk.Button(root, text="change rectangle to state disabled", command=disabled)
button2 = tk.Button(root, text="change rectangle to state normal"  , command=normal  )
rect = canvas.create_rectangle(40, 40, 180, 180,
                fill           = "red",
                activefill     = "green2",
                activeoutline  = "green3",
                activewidth    = 4,
                disabledfill   = "grey",
                disabledoutline= "grey2",
                width          = 1
                )
canvas.grid()
button1.grid()
button2.grid()
root.mainloop()

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