[FIX] web: Display event name on calendar popup instead of undefined

Purpose
=======

When you edit a Time Off Request from the dashboard. The title in the header
is undefined

https://drive.google.com/open?id=1vBg9AlVCN7rc5D6DUel8hx2uY-oOfwRs

addons/web/static/src/js/views/calendar/calendar_popover.js

@@ -123,7 +123,10 @@ var CalendarPopover = Widget.extend(StandaloneFieldManagerMixin, {
      */
     _onClickPopoverEdit: function (ev) {
         ev.preventDefault();
-        this.trigger_up('edit_event', {id: this.event.id});
+        this.trigger_up('edit_event', {
+            id: this.event.id,
+            title: this.event.record.display_name,
+        });
     },
     /**
      * @private

addons/web/static/src/js/views/calendar/calendar_renderer.js

@@ -699,7 +699,7 @@ return AbstractRenderer.extend({
             } else {
                 context.eventDate.date = isSameDayEvent ? start.clone().format('dddd, LL') : start.clone().format('LL') + ' - ' + end.clone().format('LL');
             }
-    
+
             if (eventData.record.allday && isSameDayEvent) {
                 context.eventDate.duration = _t("All day");
             } else if (eventData.record.allday && !isSameDayEvent) {
@@ -772,7 +772,10 @@ return AbstractRenderer.extend({
      */
     _onEditEvent: function (event) {
         this._unselectEvent();
-        this.trigger_up('openEvent', {_id: event.data.id});
+        this.trigger_up('openEvent', {
+            _id: event.data.id,
+            title: event.data.title,
+        });
     },
     /**
      * @private

addons/web/static/tests/views/calendar_tests.js

@@ -1902,7 +1902,7 @@ QUnit.module('Views', {
     });
 
     QUnit.test('Update event with filters', async function (assert) {
-        assert.expect(5);
+        assert.expect(6);
 
         var records = this.data.user.records;
         records.push({
@@ -1958,6 +1958,7 @@ QUnit.module('Views', {
         await testUtils.dom.click(calendar.$('.fc-event:contains(event 2) .fc-content'));
         assert.ok(calendar.$('.o_cw_popover').length, "should open a popover clicking on event");
         await testUtils.dom.click(calendar.$('.o_cw_popover .o_cw_popover_edit'));
+        assert.strictEqual($('.modal .modal-title').text(), 'Open: event 2', "dialog should have a valid title");
         await testUtils.dom.click($('.modal .o_field_widget[name="user_id"] input'));
         await testUtils.dom.click($('.ui-menu-item a:contains(user 5)').trigger('mouseenter'));
         await testUtils.dom.click($('.modal button.btn:contains(Save)'));