Gets the filename for the icon. If the
GTK_ICON_LOOKUP_USE_BUILTIN flag was passed
to gtk_icon_theme_lookup_icon(), there may be
no filename if a builtin icon is returned; in this
case, you should use gtk_icon_info_get_builtin_pixbuf().
Since 2.4
the filename for the icon, or NULL if gtk_icon_info_get_builtin_pixbuf() should be used instead. The return value is owned by GTK+ and should not be modified or freed.
Gets the filename for the icon. If the GTK_ICON_LOOKUP_USE_BUILTIN flag was passed to gtk_icon_theme_lookup_icon(), there may be no filename if a builtin icon is returned; in this case, you should use gtk_icon_info_get_builtin_pixbuf(). Since 2.4