Handle moved messages in MessageStore and message lists#787

Merged

gnprice merged 9 commits intozulip:mainfrom

gnprice:pr-move-messages

Aug 9, 2024

Commits on Aug 9, 2024

message: Expect the absence of newTopic for certain moves.

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message test [nfc]: Extract prepareOrigMessages.

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message test [nfc]: Rename message move test for accuracy.

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test [nfc]: Split eg.updateMessageMoveEvent helper.

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message [nfc]: Make displayRecipient nullable.

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message: Handle moved messages from UpdateMessageEvent.

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msglist test: Move marker message back and forth.

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msglist [nfc]: Make narrow mutable for _MessageListPageState.

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msglist: Update narrow when propagateMode is changeAll or changeLater.

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