fix: correctly set latest message in chat + lastMsgRecvTimestamp

src/Types/Chat.ts

@@ -74,7 +74,12 @@ export type ChatModification =
     | { delete: true, lastMessages: LastMessageList }
 
 export type InitialReceivedChatsState = {
-    [jid: string]: { lastMsgRecvTimestamp: number }
+    [jid: string]: {
+        /** the last message received from the other party */
+        lastMsgRecvTimestamp?: number
+        /** the absolute last message in the chat */
+        lastMsgTimestamp: number
+    }
 }
 
 export type InitialAppStateSyncOptions = {

src/Utils/history.ts

@@ -45,20 +45,30 @@ export const processHistoryMessage = (
 			}
 
 			const msgs = chat.messages || []
+			delete chat.messages
+
 			for(const item of msgs) {
 				const message = item.message!
 				const uqId = `${message.key.remoteJid}:${message.key.id}`
 				if(!historyCache.has(uqId)) {
 					messages.push(message)
 
-					const curItem = recvChats[message.key.remoteJid!]
+					let curItem = recvChats[message.key.remoteJid!]
 					const timestamp = toNumber(message.messageTimestamp)
-					if(!curItem || timestamp > curItem.lastMsgRecvTimestamp) {
-						recvChats[chat.id] = { lastMsgRecvTimestamp: timestamp }
+					if(!curItem || timestamp > curItem.lastMsgTimestamp) {
+						curItem = { lastMsgTimestamp: timestamp }
+						recvChats[chat.id] = curItem
 						// keep only the most recent message in the chat array
 						chat.messages = [{ message }]
 					}
 
+					if(
+						!message.key.fromMe
+						&& (!curItem?.lastMsgRecvTimestamp || timestamp > curItem.lastMsgRecvTimestamp)
+					) {
+						curItem.lastMsgRecvTimestamp = timestamp
+					}
+
 					historyCache.add(uqId)
 				}
 			}