fix(column): Update row island summaries when disabledSummaries changes

Author: georgianastasov

projects/igniteui-angular/src/lib/grids/columns/column.component.ts

@@ -1,4 +1,5 @@
 import { Subject } from 'rxjs';
+import { isEqual } from 'lodash-es';
 import {
     AfterContentInit,
     ChangeDetectorRef,
@@ -1090,12 +1091,16 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
      *
      * @memberof IgxColumnComponent
      */
+    @WatchColumnChanges()
     @Input()
     public get disabledSummaries(): string[] {
         return this._disabledSummaries;
     }
 
     public set disabledSummaries(value: string[]) {
+        if (isEqual(this._disabledSummaries, value)) {
+            return;
+        }
         this._disabledSummaries = value;
         if (this.grid) {
             this.grid.summaryService.removeSummariesCachePerColumn(this.field);

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.spec.ts

@@ -1085,6 +1085,40 @@ describe('Basic IgxHierarchicalGrid #hGrid', () => {
             expect(childGrid1.columns[0].editable).toBeTrue();
             expect(childGrid1.columns[1].editable).toBeTrue();
         });
+
+        it('should update the row island summary UI when disabledSummaries is changed at runtime', fakeAsync(() => {
+            const masterRow = hierarchicalGrid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
+            UIInteractions.simulateClickAndSelectEvent(masterRow.expander);
+            fixture.detectChanges();
+
+            const childGrid = hierarchicalGrid.gridAPI.getChildGrids(false)[0] as IgxHierarchicalGridComponent;
+            fixture.detectChanges();
+
+            childGrid.columns.forEach(c => c.hasSummary = true);
+            fixture.detectChanges();
+            tick();
+
+            const column = childGrid.columns.find(c => c.field === 'ProductName');
+            expect(column).toBeDefined();
+            fixture.detectChanges();
+            tick();
+
+            const summaryCells = childGrid.nativeElement.querySelectorAll('igx-grid-summary-cell');
+            const summaryCell = summaryCells[1];
+
+            expect(summaryCell).toBeDefined();
+            expect(summaryCell.textContent.trim().length).toBeGreaterThan(0);
+
+            const getterSpy = spyOnProperty(column, 'disabledSummaries', 'get').and.callThrough();
+
+            column.disabledSummaries = ['count'];
+            fixture.detectChanges();
+            tick();
+            fixture.detectChanges();
+
+            expect(getterSpy).toHaveBeenCalledTimes(7);
+            expect(summaryCell.textContent.trim()).toEqual('');
+        }));
     });
 
     describe('IgxHierarchicalGrid Children Sizing #hGrid', () => {