[FIX] calendar: Error stop displaying private name

Step to reproduce:
- Two internal users, A and B
- As A, create a calendar event and set its privacy to private
- As B, display everybody's calendar
- Double click on the private event created by A
- Click on save

Current Behaviour:
- True name is shown as part of the error

Behaviour After PR:
- For private event not related to the users, 'Busy' or it's translation is shown to the user

opw-2723904

closes odoo/odoo#82485

X-original-commit: 704a47a520c789906b7e98ef48e5cb4f6592a13a
Signed-off-by: Damhaut Florian (flda) <flda@odoo.com>

addons/calendar/models/calendar_event.py

@@ -550,6 +550,21 @@ class Meeting(models.Model):
 
         return True
 
+    def name_get(self):
+        """ Hide private events' name for events which don't belong to the current user
+        """
+        hidden = self.filtered(
+            lambda evt:
+                evt.privacy == 'private' and
+                evt.user_id.id != self.env.uid and
+                self.env.user.partner_id not in evt.partner_ids
+        )
+
+        shown = self - hidden
+        shown_names = super(Meeting, shown).name_get()
+        obfuscated_names = [(eid, _('Busy')) for eid in hidden.ids]
+        return shown_names + obfuscated_names
+
     @api.model
     def read_group(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):
         groupby = [groupby] if isinstance(groupby, str) else groupby