local echo (7/7): Support simplified version of local echo #1453
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This was referenced Apr 1, 2025
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The point of this helper is to replicate what a topic sent from the client will become, after being processed by the server. This important when trying to create a local copy of a stream message, whose topic can get translated when it's delivered by the server.
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While we do create outbox messages, there are in no way user-visible changes since the outbox messages don't end up in message list views. We create skeletons for helpers needed from message list view, but don't implement them yet, to make the diff smaller. For testing, similar to TypingNotifier.debugEnable, we add MessageStoreImpl.debugOutboxEnable for tests that do not intend to cover outbox messages. Some of the delays to fake responses added in tests are not necessary because the future of sendMessage is not completed immediately, but we still add them to keep the tests realistic.
This is an NFC because MessageListMessageItem is still the only subclass of it.
This will make MessageItem compatible with other future subclasses of MessageBase, in particular OutboxMessage, which do not need unread markers.
This adds some overhead in magnitude of O(1) (where the constant is the number of outbox messages in a view, expected to be small) on message event handling. We add outboxMessages as a list independent from messages on _MessageSequence. Because outbox messages are not rendered (the raw content is shown as plain text), we leave the 1-1 relationship between `messages` and `contents` unchanged. When computing `items`, we now start to look at `outboxMessages` as well, with the guarantee that the items related to outbox messages always come after those for other messages. Look for places that call `_processOutboxMessage(int index)` for references, and the changes to `checkInvariants` on how this affects the message list invariants. `addOutboxMessage`, similar to `handleMessage`, also look at `fetched` before adding the outbox message. However, there is no data race to prevent — we can totally not clear `outboxMessages` in `_reset`, and do the initial fetch from `MessageListView.init`, so that outbox messages do not rely on the fetched state at all. I decided against it since it is easy to check `fetched`, and making `fetchInitial` reprocess `outboxMessages` from a clean state (which is inexpensive) helps ensuring message list invariants.
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Fixes #1441