tanabata

T

H1K0 5968a7b593 fix(frontend): drive infinite scroll from scroll position, not observer transitions

The IntersectionObserver fired only on enter/leave transitions, so a scroll
that ended with the sentinel already in range (scrolling straight to the
bottom) produced no callback and nothing loaded — the user had to scroll up
and back down to force a fresh transition, loading one chunk per cycle.

Replace the observer with a capture-phase window scroll listener (capture is
required since scroll events don't bubble; it catches scrolls from the grid's
nested <main> as well as the document), rAF-throttled, re-checking the
sentinel's viewport position on every scroll. Keep the re-check on load
completion / mount for short pages and already-in-range first renders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-11 10:17:59 +03:00