When I import my calendar from ical, it does not notice the "Done" flag on
[some?] Todo entries. As a result, I get a _huge_ Todo list in Korganizer
that contains tons of Todo items that we marked "Done" in Ical. Since the
list was so huge, I couldn't test whether it had all the Todo entries I
ever had, ot just some of them (and I was too lazy to do some
experimenting), but it looked like it had all of them.