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aad563e1d5
Channel switch streamed up to 200 uncontained MessageRows (each with
synchronous shiki markdown), then scrollToBottom("auto") forced a
full-document scrollHeight read-then-write reflow before paint over
every row — the macOS beachball Will reported on v0.3.25.
Windows the main timeline on @tanstack/react-virtual. The day-grouped
section tree is flattened to a typed TimelineItem[] stream plus a
messageId->itemIndex map from one walk (cannot drift), and every
DOM-querySelector scroll path (deep-link, search-jump, jump-to-unread,
scrollToBottom, load-older anchor) is re-pathed onto the index model so
windowing does not silently break jumps to off-screen rows.
Scroll convergence is split: @tanstack/react-virtual owns offset
convergence (its rAF loop re-aims getOffsetForIndex as rows mount and
measure); a pure reducer owns only staleness re-resolution and
termination — re-resolving the target's index by id each frame so a
concurrent prepend/delete cannot strand the loop on a stale index, and
terminating when the target is deleted or a 32-frame cap is hit. The
breaking math lives in lib/ under the .mjs suite.
The thread reply list stays content-visibility:auto rather than
virtualized — it is bounded, unpaginated, ungrouped, and shares the
scroll hook, so virtualizing it would force a second index re-path and a
head/prologue split for no beachball gain. Phase-2 route-chunk preload
warms the agents/channel/lazy-view chunks on idle to clear the
Agents-menu first-visit stall.
Co-authored-by: Will Pfleger <pfleger.will@gmail.com>
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>