Geom class project idea - geom_cow

[Ivan Voras]

Christian Laursen wrote:
> I have an idea for a geom class that I think could be useful in a number
> of scenarios.
> 
> The basic idea is that it takes two existing providers and uses the first
> one as a starting point and the other one to keep changes to the first
> one using copy-on-write.

It's been discussed, and it's even on my tentative todo list (though I
can't even say when I'll have the time&resources to start...). It's even
done by my "old" gjournal project, but that aspect of it is undertested
and probably buggy.