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## Summary - replace a platform-dependent mounted-`RichText` assertion with the production follow-mode boundary predicate - retain the jump-to-latest assertion as the visible consequence of follow mode remaining off - leave production behavior and desktop PR #4549 unchanged ## Why `ScrollablePositionedList` may keep an offscreen item mounted within cache extent on macOS while Linux does not. Mounting therefore does not establish whether reversed-list item 0 is at the latest boundary. The replacement reads the list's public `itemPositionsNotifier` and applies the same `index == 0 && abs(itemLeadingEdge) < 0.01` contract used by `message_list.dart`. ## Validation At commit `bc88617e61d8e9edf8fea832baa8d918163ee212` on macOS with repo Flutter 3.41.7: - `cd mobile && ../bin/flutter test` — 1088 passed, 1 skipped - `cd mobile && ../bin/flutter analyze` — no issues - pre-push `mobile-test` and `branch-skew` hooks — passed Signed-off-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>