perf(mobile): keep feed rows and drafts stable while a bot streams - #300
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Stream chunks publish one store update each, feed entries stay referentially stable so the list redraws only changed rows, composer drafts use per-thread atoms so keystrokes stop re-rendering the route, and context-window supersedes take the fast reducer path. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
unchangedPrefixLength compared only the endpoints, so replacing an interior activity by id reported the full previous length and the authorization scan skipped the replacement. Walk the identity prefix instead and rescan from the first changed item. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Stacked on perf/web-render.
While a bot streamed, every delta rebuilt the whole mobile thread feed: all activities re-sorted with per-comparison Date allocations, every message rewrapped in a fresh object, and every visible row re-rendered, including markdown re-parses on Android. Every keystroke re-rendered the entire thread route because the composer subscribed to the whole drafts map and an unmemoized presentation object defeated the feed's memo. Context-window activity updates, which providers stream continuously, took a full filter, sort, and re-index path in the shared reducer.
Stream chunks now publish one store update per chunk in the shared runtime. Feed builds parse timestamps once and cache rows so unchanged entries keep their identity, and the list gets a stable render context plus an items-equal comparison so it redraws only rows whose content changed. Composer drafts moved to per-thread atoms with a self-contained draft composer, presentation objects are stable, and the native header options are memoized. The reducer handles context-window supersedes on the fast in-order append path, and Home rows re-render per minute only when their time label text actually changes.
Verified with 238 mobile and 69 client-runtime tests passing, including a new burst test that fails on the old per-delta publish behavior, plus clean typechecks and lint. The reconnect full-shell refetch was intentionally left alone: the snapshot carries per-connection data that event replay cannot rebuild. Not verified on a device or simulator; the render changes are covered by unit tests and reasoning only.
Created with Claude Fable 5.1 in Claude Code.
🤖 Generated with Claude Code