[FIX] mail: handle transient messages with (un)seen notions

task-2343887

closes odoo/odoo#60906

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js b/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
index affa3c05a30..ac08419f590 100644
--- a/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
+++ b/addons/mail/static/src/models/messaging_notification_handler/messaging_notification_handler.js
@@ -655,14 +655,19 @@ function factory(dependencies) {
          */
         _handleNotificationPartnerTransientMessage(data) {
             const convertedData = this.env.models['mail.message'].convertData(data);
-            const messageIds = this.env.models['mail.message'].all().map(message => message.id);
+            const lastMessageId = this.env.models['mail.message'].all().reduce(
+                (lastMessageId, message) => Math.max(lastMessageId, message.id),
+                0
+            );
             const partnerRoot = this.env.messaging.partnerRoot;
             const message = this.env.models['mail.message'].create(Object.assign(convertedData, {
                 author: [['link', partnerRoot]],
-                id: (messageIds ? Math.max(...messageIds) : 0) + 0.01,
+                id: lastMessageId + 0.01,
                 isTransient: true,
             }));
             this._notifyThreadViewsMessageReceived(message);
+            // manually force recompute of counter
+            this.messaging.messagingMenu.update();
         }
 
         /**