If Move is selected, the mouse pointer is shown as double-pointed crossed arrows in the center of the widget and the widget moves with the pointer; the move is completed when a (pressed) mouse button is released.
Size appears on the menu only if the `resizeable attribute is 1 (the default). When it is selected, the mouse pointer is shown as double-pointed crossed arrows in the center of the widget. If they are moved to touch a frame segment or, in particular, a resize corner, they are converted to an arrow and either a bar or a right angle, and moving the mouse moves the corresponding edge or edges. The resizing is finished when a (pressed) mouse button is released.
If Close is selected, the variable is freed unless the `exit attribute has been set to either 0, making close a no-op, or a callback function that will handle the request.
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