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 GtkTreeViewRowSeparatorFunc
user data to pass to @func
destroy notifier for @data
See Implementation
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.