ext box to remain responsive you must keep a reference to it.

    Call `.on_text_change` to be updated whenever the text changes.

    Call `.on_submit` to be updated whenever the user hits enter or
    leaves the text entry field.

    Attributes
    ----------
    ax : `~matplotlib.axes.Axes`
        The parent Axes for the widget.
    label : `.Text`

    color : color
        The color of the text box when not hovering.
    hovercolor : color
        The color of the text box when hovering.
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