void gtk_icon_source_set_state ( GtkIconSource* source, GtkStateType state )
Sets the widget state this icon source is intended to be used with.
Setting the widget state on an icon source makes no difference
if the state is wildcarded. Therefore, you should usually
gtk_icon_source_set_state_wildcarded() to un-wildcard it
in addition to calling this function.
Widget state this source applies to.