I was excited by this new deleteRows() function since the hardwired animation in deleteRow was causing problems when I wanted to deleted multiple rows at the same time. Unfortunately there’s a pretty serious bug in the new code; it fails if any of the rows being deleted aren’t visible.
I’ve filed bug Case 40276 using the provided test code from the widget source. It looks like it should be a trivial fix. It is trying to call an undefined function.