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    character is inserted into a Text widget by pressing a key, a default Tk
    binding to the widget's 'insert' operation is activated, and the Tk library
    processes the insert without calling back into tkinter.

    Although a binding to <Key> could be made via tkinter, what we really want
    to do is to hook the Tk 'insert' operation itself.  For one thing, we want
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    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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        Since renaming to orig fails with TclError when orig already
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Return OriginalCommand(operation) after registering function.

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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.

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    redir = WidgetRedirector(text)
    def my_insert(*args):
        print("insert", args)
        original_insert(*args)
    original_insert = redir.register("insert", my_insert)
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