My apologies, matteing! I posted then heavily edited the above OP query, then added my comment on Fuchsia - before looking for comments and reading yours. Plus

My apologies, matteing! I posted then heavily edited the above OP query, then added my comment on Fuchsia - before looking for comments and reading yours. Plus now I've edited the Fuchsia comment, too. So your reply may seem to others to ignore what I wrote - but that's not true, you were replying to a much simpler query. It was I who ignored (missed) your reply while busily typing. Next time I'll polish first, then publish (I hope.)