Sets icon as the widget used as icon on button. If icon_widget is NULL the icon is determined by the "stock_id" property. If the "stock_id" property is also NULL, button will not have an icon. Since 2.4
the widget used as icon, or NULL. [allow-none]
See Implementation
Sets icon as the widget used as icon on button. If icon_widget is NULL the icon is determined by the "stock_id" property. If the "stock_id" property is also NULL, button will not have an icon. Since 2.4