I've got a weird one: I have a QTableWidget that we're filtering, and
in my filtering function (triggered by changes in a search box), I can
set *every* row to hidden, check to see that every row is hidden, but
rows over 1000 get set back to visible.
I think this is an indication that it's time to bite the bullet and
move to a QTableView and a custom model, but it sure would be nice to
not have to do that refactoring yet...