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fa43821cf4
Switching channels reused every piece of state in MessagesList, because none of it was keyed on which conversation was being shown: - The LazyListState carried the previous channel's scroll offset, so the new channel opened at a stale position and then corrected itself. - hasScrolledToInitialPosition and followIncomingMessages carried over, so a channel entered after scrolling up in another one did not land on its newest message at all. - The arrival tracker had never seen the incoming channel's ids, so a backlog of six or fewer messages was treated as six simultaneous arrivals and each one slid in. - previousMessageCount carried over, arming placement animation for the relayout that the switch itself caused. All of it is now keyed on a conversationKey derived the same way displayMessages is. The tracker also detects a list sharing no ids with the previous one and adopts it silently, which covers /clear and any caller that does not supply a distinct key. Adds 4 tests for wholesale replacement, including the case that the burst cap cannot catch on its own.