Scheduler: fix appointment of the last day of month occupy two cells in timeline view instead of one (DevExpress#30684)

Author: aleksei-semikozov

packages/devextreme/js/__internal/scheduler/appointments/data_provider/m_appointment_filter.ts

@@ -153,8 +153,11 @@ export class AppointmentFilterBaseStrategy {
       );
 
       if (!hasRecurrenceRule) {
-        if (!(endDate >= trimMin && startDate < trimMax
-                    || dateUtils.sameDate(endDate, trimMin)
+        const isInDisplayRange = isAllDay
+          ? endDate >= trimMin && startDate < trimMax
+          : endDate > trimMin && startDate < trimMax;
+
+        if (!(isInDisplayRange || dateUtils.sameDate(endDate, trimMin)
                     && dateUtils.sameDate(startDate, trimMin))
         ) {
           return false;

packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/appointment.dataProcessor.tests.js

@@ -1057,6 +1057,32 @@ module('Client side after filtering', () => {
         });
     });
 
+    test('Appointment should be filtered if endDate is at the edge of the trimmed end view date', function(assert) {
+        const dataSource = new DataSource({ store: [] });
+        const { appointmentDataProvider, prepareDataItems } = createAppointmentDataProvider({
+            key: 0,
+            dataSource,
+            isVirtualScrolling: false,
+            dataAccessors: defaultDataAccessors
+        });
+
+        appointmentDataProvider.add({
+            text: 'a',
+            startDate: new Date(2020, 5, 16, 0),
+            endDate: new Date(2020, 6, 16, 0),
+        });
+
+        const appts = appointmentDataProvider.filterLoadedAppointments({
+            startDayHour: 0,
+            endDayHour: 24,
+            min: new Date(2020, 6, 16, 1),
+            max: new Date(2020, 6, 17, 23, 59),
+            viewOffset: 0,
+        }, prepareDataItems());
+
+        assert.ok(!appts.length, 'Filtered');
+    });
+
     test('Appointment should be filtered if startDate, endDate are at the edge of the trimmed end view date', function(assert) {
         const dataSource = new DataSource({ store: [] });
         const { appointmentDataProvider, prepareDataItems } = createAppointmentDataProvider({