Returned by usePagedList.
loadMore: () => void
It goes to useInfiniteScroll or to a LoadMoreButton.
resync: () => void
Fetches again every page loaded so far and puts them in the list's
place, keeping its length and so the scroll. The live lists call it on
useOnReconnect, for what changed while the socket was down. A page that
fails leaves the list as it was.