| GTK+ Reference Manual |
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Why. Named icons automatically adapt to theme changes, giving your application a much more integrated appearance.
Since GTK+ 2.6, named icons can be used for window icons (see
gtk_window_set_icon_name()) and images (see gtk_image_set_icon_name()gtk_drag_source_set_icon_name()) and in treeview cells (see the
:icon-name property).