[FIX] calendar: delete activity with event causes error

Before this PR:
Canceling an activity linked to an event produces error because of non provided
thread.

Steps to reproduce:
- Create an activity with event (call or meeting) in chatter
- Try to cancel this activity
- There is an error about undefined thread and activity remains on the chatter

After this PR:
- Thread is provided in `onUpdate` method to use in `load()` in chatter
- `activityService` deletes the activity with event in `unlink` patch

closes odoo/odoo#152737

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/calendar/static/src/activity/activity_patch.js

@@ -17,8 +17,10 @@ patch(Activity.prototype, {
      */
     async unlink() {
         if (this.props.data.calendar_event_id) {
+            const thread = this.thread;
+            this.activityService.delete(this.props.data);
             await this.orm.call("mail.activity", "unlink_w_meeting", [[this.props.data.id]]);
-            this.props.onUpdate();
+            this.props.onUpdate(thread);
         } else {
             super.unlink();
         }

addons/calendar/static/tests/activity_tests.js

@@ -35,3 +35,33 @@ QUnit.test("activity click on Reschedule", async () => {
     await click(".btn", { text: "Reschedule" });
     await contains(".o_calendar_view");
 });
+
+QUnit.test("Can cancel activity linked to an event", async () => {
+    const pyEnv = await startServer();
+    const partnerId = pyEnv["res.partner"].create({ name: "Milan Kundera" });
+    const activityTypeId = pyEnv["mail.activity.type"].create({
+        icon: "fa-calendar",
+        name: "Meeting",
+    });
+    const attendeeId = pyEnv["calendar.attendee"].create({
+        partner_id: partnerId,
+    });
+    const calendaMeetingId = pyEnv["calendar.event"].create({
+        res_model: "calendar.event",
+        name: "meeting1",
+        start: "2022-07-06 06:30:00",
+        attendee_ids: [attendeeId],
+    });
+    pyEnv["mail.activity"].create({
+        name: "Small Meeting",
+        activity_type_id: activityTypeId,
+        can_write: true,
+        res_id: partnerId,
+        res_model: "res.partner",
+        calendar_event_id: calendaMeetingId,
+    });
+    const { openFormView } = await start();
+    await openFormView("res.partner", partnerId);
+    await click(".o-mail-Activity .btn", { text: "Cancel" });
+    await contains(".o-mail-Activity", { count: 0 });
+});

addons/calendar/static/tests/helpers/mock_server/models/mail_activity.js

@@ -1,10 +1,10 @@
 /** @odoo-module **/
 
 // ensure mail override is applied first.
-import '@mail/../tests/helpers/mock_server/models/mail_activity';
+import "@mail/../tests/helpers/mock_server/models/mail_activity";
 
 import { patch } from "@web/core/utils/patch";
-import { MockServer } from '@web/../tests/helpers/mock_server';
+import { MockServer } from "@web/../tests/helpers/mock_server";
 
 patch(MockServer.prototype, {
     //--------------------------------------------------------------------------
@@ -15,16 +15,23 @@ patch(MockServer.prototype, {
      * @override
      */
     async _performRPC(route, args) {
-        if (args.model === 'mail.activity' && args.method === 'action_create_calendar_event') {
+        if (args.model === "mail.activity" && args.method === "action_create_calendar_event") {
             return {
-                type: 'ir.actions.act_window',
+                type: "ir.actions.act_window",
                 name: "Meetings",
-                res_model: 'calendar.event',
-                view_mode: 'calendar',
-                views: [[false, 'calendar']],
-                target: 'current',
+                res_model: "calendar.event",
+                view_mode: "calendar",
+                views: [[false, "calendar"]],
+                target: "current",
             };
         }
+        if (args.model === "mail.activity" && args.method === "unlink_w_meeting") {
+            const activities = this.getRecords("mail.activity", [["id", "in", args.args[0]]]);
+            const eventIds = activities.map((act) => act.calendar_event_id);
+            const res = this.mockUnlink("mail.activity", args.args[0]);
+            this.mockUnlink("calendar.event", eventIds);
+            return res;
+        }
         return super._performRPC(...arguments);
     },
 });