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npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7andWill Pfleger
c4ed798022
Re-platforms the index-anchor scroll model onto eva's single-owner anchor (useAnchoredScroll) so the virtualized timeline keeps one scroll writer under windowing. Removes eva's older-history IntersectionObserver and makes useLoadOlderOnScroll the sole top-sentinel/fetchOlder owner; eva's anchored scrollBy cedes to the index path on a prepend via a front-id/tail-id discriminator (new prevFirstMessageIdRef). Adds a minimal restoreScrollPosition writer that re-derives the anchor after a programmatic scroll instead of re-introducing a competing scroll-owner. Windowed-out jump targets converge through the virtualizer (indexByMessageId + getOffsetForIndex) rather than a querySelector that goes null off-screen. Load-older roles are gated on fetchOlder/virtualizer presence so MessageThreadPanel degrades to the passive anchor. Reserves a fixed-height spinner slot so the fetch indicator does not shift the bottom row. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>