GtkStatusbar::set_has_resize_grip
Sets whether or not a resize grip should be shown in the status bar. If setting is true, a resize grip will be shown. Otherwise the resize grip will be hidden.
A resize grip is a part of the widget that the use can drag to resize the top level window. Resize grips are normally shown as a triangle in the lower right corner of the status bar.
A resize grip is shown by default.
See also: get_has_resize_grip()