refresh method
Re-fetches the currently loaded pages, discarding what was known about the end (it may have moved).
Notifies an EntityPaginationReset with isRefresh: true, then the
events of the re-fetched pages.
Implementation
FutureOr<void> refresh() {
var pages = loadedPages;
_resetImpl(isRefresh: true);
if (pages.isEmpty) return null;
return pages
.map((page) => loadPage(page))
.resolveAll()
.resolveMapped((_) => null);
}