I should be able to copy a Space

Summary: This is sort of like Extract App, but simpler: just take this Space, and make a copy of it, with no long-term maintenance implication.

Ideally, you should be able to control what gets copied, similar to the way you control what gets extracted into an App. But that might be a stretch goal.

Alternatively, this might be a UI on top of export/import. But note that that functionality is currently broken, and probably needs re-implementation, so it isn't clear whether it makes sense to try to use it for this.

No, I simply misremembered the above: in fact, the import/export system is still working decently well. There may be some bugs still, but it serves as a poor man's version of Copy Space already, and the real version probably can and should simply be a UI over this.

Given that it already works, I'm going to downgrade the priority here: it's definitely nice to have, but the workaround is easy enough that the UI isn't critical at this time.