Review round 1 on the scroll-position feature:
- F1: add two tests for the hook's subtlest invariants — (a2) the restore
target is captured synchronously at mount and survives a fresh scroll@0
overwriting storage on load (a regression moving the capture into an effect
would now fail); (a3) restore runs at most once per mount even when called
again (the wiring effect can re-run).
- F2: log instead of silently swallowing sessionStorage errors in
readStorage/writeStorage (AGENTS.md "errors must never be swallowed" rule);
no user notification since a missed scroll restore is not actionable.
- F3: document the hard dependency on PageEditor remounting per page
(key={page.id}) at the refs declaration — the per-mount refs are not reset
on an in-place pageId change, so removing that key would break restore on
the 2nd page.
vitest 9/9, tsc 0, eslint 0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds useScrollPosition(pageId): saves window.scrollY to sessionStorage
(key gitmost:scroll-position:<pageId>) on throttled scroll / pagehide /
visibilitychange / cleanup, capturing the previously-saved value
synchronously at mount before any handler can overwrite it with the fresh 0.
restoreScrollPosition() (wired in page-editor.tsx to fire once the live
content is laid out, !showStatic && editor) yields to a #hash anchor, then
polls the document height and scrolls to the saved Y once the content is
tall enough, with a 5s timeout clamped to the max reachable position. All
storage access is try/caught so a disabled/quota'd Storage never breaks the
page. The in-flight restore poll is held in a ref and cancelled on unmount,
so a fast SPA navigation can't scroll the next page. closes#266
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
