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975f4ef38d
The content-visibility virtualization from #66470 stopped engaging on agent sessions. Its live tail — the newest turns kept always-rendered so a turn is only virtualized once its height has settled — was sized as a raw count of 6 turns, while everything else in this file budgets in rendered PARTS (RENDER_BUDGET=300, FIRST_PAINT_BUDGET=20). Those units diverge badly on agent transcripts. A chat turn is 2-6 parts, but a turn with tool calls is 50-200, so "6 turns" can exempt the entire visible transcript. Measured on a 5-tile window (7/3/5/3/2 groups per tile): zero content-visibility containers were active anywhere, and every Radix overlay open paid the full whole-document style recalc that #66470 exists to avoid (~610ms of a ~700ms open, in a handful of enormous recalcs rather than any long task). Size the tail by parts instead, clamped to [2, 6] turns. The floor keeps the streaming turn rendered when turns are huge, preserving the anti-drift guarantee; the ceiling stops a tail of tiny turns from reaching further back than the old turn-count policy did, so no transcript shape renders more than before. `liveTailStart` replaces the per-row `isVirtualizedGroup` predicate and is computed once per render off the weighted groups. Parts left always-rendered, real transcript shapes: | shape | before | after | |------------------------------|--------|-------| | agent tile (7 tool-heavy) | 690 | 270 | | agent tile (5 turns) | 535 | 225 | | long agent session (40) | 720 | 240 | | long chat (40 short turns) | 24 | 24 | |
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