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    processes the insert without calling back into tkinter.

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    same as the pathname widget._w.  This command is used to invoke the various
    widget operations, e.g. insert (for a Text widget). We are going to hook
    this command and provide a facility ('register') to intercept the widget
    operation.  We will also intercept method calls on the Tkinter class
    instance that represents the tk widget.

    In IDLE, WidgetRedirector is used in Percolator to intercept Text
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Return OriginalCommand(operation) after registering function.

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        from command dispatch.

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        first function is replaced in both places.
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        operation through to Tk via the original Tcl function.

        Note that if a registered function is called, the operation is not
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Callable for original tk command that has been redirected.

    Returned by .register; can be used in the function registered.
    redir = WidgetRedirector(text)
    def my_insert(*args):
        print("insert", args)
        original_insert(*args)
    original_insert = redir.register("insert", my_insert)
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