MM-33359 corrected unread replies update (#17068)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/notification.go

@@ -183,16 +183,10 @@ func (a *App) SendNotifications(post *model.Post, team *model.Team, channel *mod
 			mac := make(chan *model.AppError, 1)
 			go func(userID string) {
 				defer close(mac)
-				incrementMentions := false
-				for mid := range mentions.Mentions {
-					if userID == mid {
-						incrementMentions = true
-						break
-					}
-				}
-				nErr := a.Srv().Store.Thread().CreateMembershipIfNeeded(userID, post.RootId, true, incrementMentions, *a.Config().ServiceSettings.ThreadAutoFollow)
-				if nErr != nil {
-					mac <- model.NewAppError("SendNotifications", "app.channel.autofollow.app_error", nil, nErr.Error(), http.StatusInternalServerError)
+				_, incrementMentions := mentions.Mentions[userID]
+				err := a.Srv().Store.Thread().MaintainMembership(userID, post.RootId, true, incrementMentions, *a.Config().ServiceSettings.ThreadAutoFollow, userID == post.UserId)
+				if err != nil {
+					mac <- model.NewAppError("SendNotifications", "app.channel.autofollow.app_error", nil, err.Error(), http.StatusInternalServerError)
 					return
 				}
 
@@ -439,7 +433,6 @@ func (a *App) SendNotifications(post *model.Post, team *model.Team, channel *mod
 				sendEvent = preference.Value == "on"
 			}
 			if sendEvent {
-
 				message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_THREAD_UPDATED, team.Id, "", uid, nil)
 				userThread, _ := a.Srv().Store.Thread().GetThreadForUser(uid, channel.TeamId, thread.PostId, true)
 				a.sanitizeProfiles(userThread.Participants, false)