| .. | .. |
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| 20 | 20 | |
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| 21 | 21 | useEffect(() => { |
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| 22 | 22 | if (messages.length > 0) { |
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| 23 | | - // If the message count changed by more than 1, it's a session switch or |
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| 24 | | - // initial load — snap to bottom instantly instead of visibly scrolling. |
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| 25 | 23 | const delta = Math.abs(messages.length - prevLengthRef.current); |
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| 26 | | - const animated = delta === 1; |
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| 27 | | - const delay = delta > 1 ? 200 : 50; |
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| 28 | | - setTimeout(() => { |
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| 29 | | - listRef.current?.scrollToEnd({ animated }); |
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| 30 | | - }, delay); |
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| 24 | + if (delta > 1) { |
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| 25 | + // Bulk load (restart, session switch) — FlatList renders lazily, |
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| 26 | + // so fire multiple scroll attempts to catch late renders. |
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| 27 | + for (const delay of [100, 300, 700]) { |
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| 28 | + setTimeout(() => { |
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| 29 | + listRef.current?.scrollToEnd({ animated: false }); |
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| 30 | + }, delay); |
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| 31 | + } |
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| 32 | + } else { |
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| 33 | + // Single new message — smooth scroll |
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| 34 | + setTimeout(() => { |
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| 35 | + listRef.current?.scrollToEnd({ animated: true }); |
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| 36 | + }, 50); |
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| 37 | + } |
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| 31 | 38 | } |
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| 32 | 39 | prevLengthRef.current = messages.length; |
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| 33 | 40 | }, [messages.length, isTyping, lastContent]); |
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