Hide a canvas by shrinking it vertically to zero height over a period of time. This method will not fire if the widget is already drawn and visible, or has overflow other than "visible" or "hidden".
@param effect How should the content of the window be hidden during the hide? If ommitted, default behavior canbe configured via {@link com.smartgwt.client.widgets.Canvas#getAnimateHideEffect animateHideEffect}
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