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perf(client): smoother chat scrolling with wider list cache #1116

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perf(client): smoother chat scrolling with wider list cache #1116

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6 changes: 6 additions & 0 deletions apps/client/lib/src/widgets/chat_panel/chat_message_list.dart
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Expand Up @@ -252,6 +252,12 @@ class ChatMessageList extends ConsumerWidget {
child: ListView.builder(
controller: scrollController,
padding: const EdgeInsets.only(bottom: 16),
// Pre-build ~one viewport of off-screen messages on each side so that
// momentum scrolling doesn't flash blank space while items mount. The
// Flutter default of 250 is too tight for chat where rows include
// images, reactions, and reply quotes that each take a frame to lay
// out. Tuned conservatively to keep memory in check on long histories.
cacheExtent: 600,
itemCount: messages.length + 1,
itemBuilder: (context, index) {
if (index == 0) {
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