Pulls in the foliate-js fix that guards Paginator#scrollBy and
Paginator#snap against an uninitialized #scrollBounds. Without the
guard, a swipe that lands before the first #scrollToPage seeds the
bounds (e.g. a fast swipe right after the reader mounts, or while a
section is still loading) crashes with
TypeError: undefined is not iterable (cannot read property
Symbol(Symbol.iterator)) at Paginator.snap
The submodule fix bails out of both entry points when the bounds aren't
ready yet, so the swipe is dropped rather than fatal; subsequent
settled scrolls reseed the bounds and swipe handling resumes.
loveheaven
31176e5d47