feat(backup): send a signal to reset chat cursors on message imports

Needed for status-im/status-desktop#18824

Author: jrainville

protocol/messenger_backup_handler.go

@@ -16,6 +16,7 @@ import (
 	"github.com/status-im/status-go/protocol/protobuf"
 	"github.com/status-im/status-go/protocol/wakusync"
 	ensservice "github.com/status-im/status-go/services/ens"
+	"github.com/status-im/status-go/signal"
 )
 
 const (
@@ -57,6 +58,8 @@ func (m *Messenger) handleLocalBackup(state *ReceivedMessageState, backup *proto
 		if err != nil {
 			errors = append(errors, err)
 		}
+
+		signal.SendChatCursorReset()
 	}
 
 	return errors

signal/events_shhext.go

@@ -39,6 +39,9 @@ const (
 	// EventNewMessages is triggered when we receive new messages
 	EventNewMessages = "messages.new"
 
+	// EventChatCursorReset is triggered when a chat cursor needs to be reset on the client side
+	EventChatCursorReset = "messages.chat.cursor.reset"
+
 	// EventHistoryRequestStarted is triggered before processing a store request
 	EventHistoryRequestStarted = "history.request.started"
 
@@ -213,6 +216,10 @@ func SendNewMessages(obj json.Marshaler) {
 	send(EventNewMessages, obj)
 }
 
+func SendChatCursorReset() {
+	send(EventChatCursorReset, interface{}(nil))
+}
+
 func sendStoreNodeSignal(ms *messagingtypes.StoreNode, event string) {
 	msSignal := StoreNodeSignal{}
 	if ms != nil {