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* ios, android, desktop: do not add loaded items of another chat to the opened chat
apiLoadMessages could apply a loaded page to a chat it was not loaded for,
mixing messages of two chats in one list:
- the chat id was not checked at all for .last pagination, and the loading
coroutine is not cancelled when the chat is closed (PreloadItems wraps it
into NonCancellable, apiFindMessages runs in a scope of its own), so a .last
page loaded for the previously opened chat was appended to the items of the
chat opened while it was loading;
- for the other paginations the chat id was checked before the items were
loaded, but they are applied on the main thread after a dispatch, so the chat
could be switched in between.
Check the chat id (and the remote host id in kotlin) right before the items are
applied, in every pagination except .initial and opening around item that set
chat id themselves. Empty chatItems remain allowed for .last that is used for
searching.
* android, desktop: test that loaded items of another chat are not added to the opened chat
Reproduces the bug deterministically, without depending on the timing of the
race: processLoadedChat is called with a page loaded for another chat while the
opened chat has its own items.
Without the fix the items of the two chats end up in one list:
lastPageLoadedForAnotherChatIsNotAddedToOpenedChat
expected:<[101, 102]> but was:<[101, 102, 201, 202]>
beforePageLoadedForAnotherChatIsNotAddedToOpenedChat
expected:<[101, 102]> but was:<[201, 202, 101, 102]>
aroundPageLoadedForAnotherChatIsNotAddedToOpenedChat
expected:<[101, 102]> but was:<[101, 102, 201, 202]>