ok but this isn’t a very helpful answer for a number of reasons:
- It could happen outside of ‘learning’. In the real world if I were a theme designer, I might send a theme to someone who has a live site where they’ve done stuff. How can I as a theme designer, ensure that some long ago deleted block in a content area no longer even used by my theme doesn’t forevermore insert 7 orphaned content areas?
- Either there is a way to avoid this in my theme, or a more proper way to remove content from a site … but I still don’t know which.
- Where is the “Main” content area that should be there but isn’t?
Also … the concrete installer doesn’t seem to be very reliable. I have failed something like 24/25 times to get it to work.