This would be really useful, since I use IDLE a lot when I wanna do something fast, and indentation is so important. The other keyboard shortcut doesnt really work on my layout

Bumping this PR. Very nice feature, implementation seems good, someone should build to double check.

I added comments to issue about what I think ShiftTab should do. I will manually what it does do, on Windows, tomorrow. Stan, can you try it on Linux?

The current implementation is broken, whenever I try to dedent I get:

Exception in Tkinter callback
Traceback (most recent call last):
  File "cpython/Lib/tkinter/__init__.py", line 2088, in __call__
    return self.func(*args)
           ~~~~~~~~~^^^^^^^
  File "cpython/Lib/idlelib/editor.py", line 1402, in smart_dedent_event
    raw, effective = classifyws(prefix, self.tabwidth)
                     ^^^^^^^^^^
NameError: name 'classifyws' is not defined

This PR is stale because it has been open for 30 days with no activity.

Bump