tk/winfo manager

(tk/winfo 'manager #<widget>)
Returns the name of the geometry manager currently responsible for #<widget>, or an empty string if #<widget> isn't managed by any geometry manager. The name is usually the name of the Tcl command for the geometry manager, such as pack or place. If the geometry manager is a widget, such as canvases or text, the name is the widget's class command, such as canvas.

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