gtk:combo-box-set-row-separator-func (combo func)

combo -- a gtk:combo-box widget
func -- a gtk:tree-view-row-separator-func callback function

Sets the row separator function, which is used to determine whether a row should be drawn as a separator. If the row separator function is nil, no separators are drawn. This is the default value. The gtk:combo-box implementation is deprecated since 4.10. Use the gtk:drop-down widget instead.