[IMP] mail: remove Thread/compute static method

Task-2806655

closes odoo/odoo#87354

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

addons/mail/static/src/models/messaging_notification_handler.js

@@ -323,10 +323,6 @@ registerModel({
                     pendingSeenMessageId: undefined,
                 });
             }
-            if (shouldComputeSeenIndicators) {
-                // FIXME force the computing of thread values (cf task-2261221)
-                this.messaging.models['Thread'].computeLastCurrentPartnerMessageSeenByEveryone(channel);
-            }
         },
         /**
          * @private

addons/mail/static/src/models/thread.js

@@ -122,17 +122,6 @@ registerModel({
         },
     },
     modelMethods: {
-        /**
-         * @param {Thread} [thread] the concerned thread
-         */
-        computeLastCurrentPartnerMessageSeenByEveryone(thread = undefined) {
-            const threads = thread ? [thread] : this.messaging.models['Thread'].all();
-            threads.map(localThread => {
-                localThread.update({
-                    lastCurrentPartnerMessageSeenByEveryone: localThread._computeLastCurrentPartnerMessageSeenByEveryone(),
-                });
-            });
-        },
         /**
          * @param {Object} data
          * @return {Object}