fix(calendar): dont recalculate next date #4282

Author: hanastasov

projects/igniteui-angular/src/lib/calendar/calendar.component.spec.ts

@@ -1040,7 +1040,6 @@ describe('IgxCalendar', () => {
 
             selectedDates.forEach(d => {
                 expect(d.selected).toBe(true);
-                expect(d.isSelectedCSS).toBe(true);
             });
 
             const notSelectedDates = calendar.daysView.dates.toArray().filter(d => {
@@ -1051,7 +1050,6 @@ describe('IgxCalendar', () => {
 
             notSelectedDates.forEach(d => {
                 expect(d.selected).toBe(false);
-                expect(d.isSelectedCSS).toBe(false);
             });
         });
     });

projects/igniteui-angular/src/lib/calendar/days-view/days-view.component.ts

@@ -382,9 +382,6 @@ export class IgxDaysViewComponent extends IgxCalendarBase implements DoCheck {
 
         if (!this.isDayFocusable(day)) {
             day = dates[i - 7];
-            if (!day) {
-                this.nextDate = this.calendarModel.timedelta(this.nextDate, 'day', -7);
-            }
         }
 
         // focus item in next month, which is currently out of view
@@ -442,9 +439,6 @@ export class IgxDaysViewComponent extends IgxCalendarBase implements DoCheck {
 
         if (!this.isDayFocusable(day)) {
             day = dates[i + 7];
-            if (!day) {
-                this.nextDate = this.calendarModel.timedelta(this.nextDate, 'day', 7);
-            }
 
         }
 
@@ -504,9 +498,6 @@ export class IgxDaysViewComponent extends IgxCalendarBase implements DoCheck {
 
         if (!this.isDayFocusable(day)) {
             day = dates[i - 1];
-            if (!day) {
-                this.nextDate = this.calendarModel.timedelta(this.nextDate, 'day', -1);
-            }
         }
 
         // focus item in previous month, which is currently out of view
@@ -565,9 +556,6 @@ export class IgxDaysViewComponent extends IgxCalendarBase implements DoCheck {
 
         if (!this.isDayFocusable(day)) {
             day = dates[i + 1];
-            if (!day) {
-                this.nextDate = this.calendarModel.timedelta(this.nextDate, 'day', 1);
-            }
         }
 
         // focus item in next month, which is currently out of view