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 null, no separators are drawn. This is the default value.
a gtk.types.TreeViewRowSeparatorFunc
Deprecated: Use gtk.drop_down.DropDown
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 null, no separators are drawn. This is the default value.