The annotator's foliate `load` handler (onLoad) attached a renderer
`scroll` listener and, on Android, a global `native-touch` dispatcher
listener on every section load. Both the renderer and the eventDispatcher
outlive individual sections — and foliate fires `load` for preloaded
neighbour sections too — so these listeners accumulated without bound, one
set per chapter. Each renderer `scroll` (fired on every paragraph-mode
`goTo`) then ran all of them, and on Android the scroll/native-touch
handlers do real work. Reading a long book (e.g. a 3000-chapter web novel)
in paragraph mode slowed down steadily after a few chapters and only an
app restart cleared it.
Register these listeners once per view via a new `useRendererInputListeners`
hook with cleanup, instead of once per section load. The native-touch
handler now resolves the CURRENT primary section's doc/index at fire time
rather than capturing a (possibly off-screen, preloaded) section's. The
redundant `scroll` → `repositionPopups` listener is dropped — a dedicated
effect already repositions popups on scroll. Doc-scoped listeners stay in
onLoad, since they die with the section's iframe.
Add useRendererInputListeners unit tests covering register-once-per-view,
no-accumulation-across-re-renders, latest-handler routing, Android gating,
and unmount cleanup.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
bc9b8b23e6