fix(filtering): Fix issue when switch conditions #6519

Author: astaev

projects/igniteui-angular/src/lib/grids/filtering/base/grid-filtering-row.component.ts

@@ -462,12 +462,14 @@ export class IgxGridFilteringRowComponent implements AfterViewInit {
             this.expressionsList[0].expression.searchVal === null &&
             this.expressionsList[0].expression.condition.isUnary === false) {
             this.filteringService.getExpressions(this.column.field).pop();
+
+            this.filter();
         } else {
-            this.expressionsList.forEach((item) => {
-                if (item.expression.searchVal === null && !item.expression.condition.isUnary) {
-                    this.filteringService.removeExpression(this.column.field, this.expressionsList.indexOf(item));
-                }
-            });
+            const condToRemove = this.expressionsList.filter(ex => ex.expression.searchVal === null && !ex.expression.condition.isUnary);
+            if (condToRemove && condToRemove.length > 0) {
+                condToRemove.forEach(c => this.filteringService.removeExpression(this.column.field, this.expressionsList.indexOf(c)));
+                this.filter();
+            }
         }
 
         this.filteringService.isFilterRowVisible = false;

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

@@ -1969,6 +1969,23 @@ describe('IgxGrid - Filtering Row UI actions #grid', () => {
             const activeFilterIcon = header.nativeElement.querySelector('.igx-excel-filter__icon--filtered');
             expect(activeFilterIcon).toBeDefined('no active filter icon was found');
         }));
+
+        it('Should clear non-unary conditions with null searchVal when close', fakeAsync(() => {
+            GridFunctions.clickFilterCellChip(fix, 'ProductName');
+            fix.detectChanges();
+
+            GridFunctions.openFilterDD(fix.debugElement);
+            const dropdownList = fix.debugElement.query(By.css('div.igx-drop-down__list.igx-toggle'));
+            GridFunctions.selectFilteringCondition('Empty', dropdownList);
+            fix.detectChanges();
+            GridFunctions.openFilterDD(fix.debugElement);
+            GridFunctions.selectFilteringCondition('Contains', dropdownList);
+            fix.detectChanges();
+            GridFunctions.closeFilterRow(fix);
+
+            const headerChip = GridFunctions.getFilterChipsForColumn('ProductName', fix);
+            expect(headerChip.length).toBe(1);
+        }));
     });
 
     describe('Integration scenarios', () => {