New submission from Stephen Paul Chappell <noctis.skyto...@gmail.com>:

In the latest Python 3.8.0 installation when running IDLE on Windows, pressing 
"Alt + T" generates the following error:

    Exception in Tkinter callback
    Traceback (most recent call last):
      File "C:\Program Files\Python38\Lib\tkinter\__init__.py", line 1883, in 
__call__
        return self.func(*args)
      File "C:\Program Files\Python38\Lib\idlelib\multicall.py", line 176, in 
handler
        r = l[i](event)
    TypeError: toggle_tabs_event() missing 1 required positional argument: 
'event'

Similarly, pressing "Alt + U" will generate a very similar error:

    Exception in Tkinter callback
    Traceback (most recent call last):
      File "C:\Program Files\Python38\Lib\tkinter\__init__.py", line 1883, in 
__call__
        return self.func(*args)
      File "C:\Program Files\Python38\Lib\idlelib\multicall.py", line 176, in 
handler
        r = l[i](event)
    TypeError: change_indentwidth_event() missing 1 required positional 
argument: 'event'

----------
assignee: terry.reedy
components: IDLE, Windows
messages: 355678
nosy: Zero, paul.moore, steve.dower, terry.reedy, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: "Alt + T" and "Alt + U" Broken in IDLE on Windows
type: behavior
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38636>
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