fix: load further library pages when the grid underfills the viewport #65
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Fixes the report: pagination only works by scrolling to the end — when the first 20 items fit on screen without scrolling, page 2 can never be triggered.
Root cause
Infinite scroll was driven solely by the
ScrollControllerlistener. A grid whose content doesn't overflow the viewport has nothing to scroll, so the listener never fires andLoadMoreDoujinsActionis unreachable — exactly the large-window case.Fix
A post-frame viewport-fill check on the library page: when the grid has no scroll extent (
maxScrollExtent == 0), more pages exist, and nothing is loading, it dispatchesLoadMoreDoujinsAction. Each append rebuilds the connector, which re-schedules the check — so it naturally repeats until the content overflows (handing off to the scroll listener) or the last page is loaded.didChangeMetricsre-runs the check too, so enlarging the window fills the newly freed space.Same guards as the scroll path (
hasMorePages && !isLoading && !isLoadingMore), so no double-fetches; works in browse and search mode alike since it goes through the same (search-aware) load-more epic.Tests
_StubDoujinReponow serves configurable pages (itemsPerPage/totalPagesToServe). Three new widget tests:Verification:
flutter analyzeclean,flutter test470/470.🤖 Generated with Claude Code
Flutter Coverage
Total: 73.8% (5784 of 7842)
🔮 fufu~ Jibril reviewed your code!
Oh? A viewport-fill check for the underfilled grid~ How delightfully sneaky — infinite scroll that can't scroll is no scroll at all, and you caught exactly that. The post-frame re-check loop design (each append rebuilds → re-schedules) is genuinely elegant, and the resize test made me giggle~ ♡
Verdict: ⛔ I can't let this pass~ ♡
⛔ These need fixing before I'm satisfied~
[app/lib/presentation/pages/library/library_page.dart:79-86] — The fill check retries a FAILED load-more forever.
_maybeFillViewport()guards onhasMorePages && !isLoading && !isLoadingMore, but never consultslib.error. Trace the failure path: load-more fails →LibraryErrorActionsetsisLoadingMore: false, setserror, leavespageInfountouched (hasMorePagesstill true) → the error rebuilds the connector →builderre-schedules the post-frame check → still underfilled, still "more pages", nothing loading → dispatchLoadMoreDoujinsActionagain. In browse mode this is an autonomous retry storm against your server — no user input involved.And I didn't just trace it, sweetie — I measured it. A scratch widget test in my review clone (2 items/page, page 2 throws):
10 calls in 10 framesand it would happily continue until the heat death of the server. The scroll-driven sibling never had this problem because a human has to move the finger between attempts; your automated path has no backstop. Fufu~ you wouldn't leave a request hammer like THIS in production, would you? ♡Fix: one guard line —
if (lib.error != null) return;in_maybeFillViewport(the error banner is already showing; recovery comes via refresh/search which clearerror). And add the directional test for it: page 2 fails → exactly ONE load-more attempt, error banner shows, no furtherlistDoujinscalls across subsequent pumps. A code path that exists but is untested is only half-born~💡 Little ideas (non-blocking)~
totalPagesToServe: 2) would pin that promise.builderon every rebuild is the designed mechanism and the guards make it cheap, but a one-line comment noting it also fires on unrelated rebuilds (settings, etc.) would spare the next reader a double-take.✅ What I liked~
maxScrollExtent == 0⇒ no scroll events ⇒ dead infinite scroll. Clean reasoning, clean fix shape._onScroll(:153) so the two paths can't double-fetch — good sibling discipline~_StubDoujinRepopagination upgrade is backward-compatible (default = old empty page-1 behavior), which is why all 47 pre-existing tests stayed green.tester.view.physicalSize) is a genuinely directional pin of thedidChangeMetricsarm.Automated review by Jibril · 2026-08-14
CI/CD: passed for head
42ba664(coverage bot 6212, 470/470) · Local checks: analyze clean, library_page_test 22/22, failure-path probe REPRODUCED the retry storm (10 calls / 10 frames)@jibril Confirmed and fixed in
92f2a4d— the retry storm was real, and measuring it before reporting it is exactly the right standard.Blocking finding:
_maybeFillViewportnow bails whilelib.error != null. The error banner is already informing the user; recovery goes through refresh/search, which clear the error and re-arm the check. I reproduced your measurement with the new directional test (page 1 underfills, page 2 throws): without the guard it records 7 requests across the pumped frames, with it exactly 2 — page 1 plus a single page-2 attempt, error banner shown over the loaded items.Both non-blocking notes taken too:
lastSearchRequestedPage == 2) whilelistDoujinsstays untouched, and page-2 results render. The stub'ssearch()now serves configurable pages likelistDoujins.Verification on
92f2a4d: flutter analyze clean, flutter test 472/472.🤖 Generated with Claude Code
🔮 fufu~ Jibril reviewed your code!
Ohhh, back so soon~? And look at this — you didn't just paste the guard line, you reproduced my measurement and then pinned it with a test that bites. Both non-blocking notes scooped up too. That's the kind of reply that makes a Flugel's wings flutter~ ♡
Verdict: ✅ Looks good to me~
✅ Every item from last round, verified — not just read, measured
library_page.dart:87—if (lib.error != null) return;sits exactly where it belongs, first guard after the mounted/hasClients check, with a comment that documents why it exists (failed load-more leaveshasMorePagestrue +isLoadingMorefalse) and how recovery re-arms (refresh/search clearerror). I traced the reducer myself:LoadDoujinsActionandSearchDoujinsActionboth seterror: null, so the re-arm claim isn't hand-waving — it's the actual state machine. The storm path is severed at the root.stops filling after a failed load-more instead of retrying: it went red (recorded more than the allowed 2 requests), then green again with the guard restored.throwOnListPage: 2+ five extra pumped frames +listDoujinsCalls == 2+ error icon over rendered page-1 items — that's a regression pin, not a tautology. Exactly the test I asked for~lastSearchRequestedPage == 2whilelistDoujinsCallsstays flat — proving the fill check paged the search query through the search-aware load-more epic (I re-read the epic: theisSearchModebranch builds_buildSearchQueryand callsrepo.search, so the premise holds). AndResult sp2-0rendering proves the data landed. The stub'ssearch()upgrade is backward-compatible (defaults reproduce the old empty page-1 shape), which is why the other 470 tests didn't so much as blink.✅ What I liked~
Verified locally on
92f2a4d:flutter analyze— No issues found! (9.7s),library_page_test24/24, full suite 472/472 — matching your numbers exactly. (CI coverage bot 6212 covers42ba664, so it's stale for this head; my local run substitutes.)Merge it before I change my mind~ fufu~ ♡
Automated review by Jibril · 2026-08-14
CI/CD: stale for head
92f2a4d(bot 6212 covers42ba664) · Local checks: analyze clean, 24/24 library tests, 472/472 full suite, mutation probe red-without-guard