chore(combo): remove redundant touch callback call

Author: damyanpetev

projects/igniteui-angular/src/lib/combo/combo.component.html

@@ -9,7 +9,7 @@
         <ng-content select="igx-hint, [igxHint]"></ng-content>
     </ng-container>
     <input igxInput #comboInput name="comboInput" type="text" [value]="value" readonly [attr.placeholder]="placeholder"
-        [disabled]="disabled" (blur)="onBlur()" (focus)="onFocus()"/>
+        [disabled]="disabled" (blur)="onBlur()" />
     <ng-container ngProjectAs="igx-suffix">
         <ng-content select="igx-suffix"></ng-content>
     </ng-container>

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

@@ -118,11 +118,8 @@ describe('igxCombo', () => {
             spyOnProperty(combo, 'collapsed').and.returnValue(true);
             spyOnProperty(combo, 'valid', 'set');
 
-            combo.onFocus();
-            expect(mockNgControl.registerOnTouchedCb).toHaveBeenCalledTimes(1);
-
             combo.onBlur();
-            expect(mockNgControl.registerOnTouchedCb).toHaveBeenCalledTimes(2);
+            expect(mockNgControl.registerOnTouchedCb).toHaveBeenCalledTimes(1);
         });
         it('should correctly handle ngControl validity', () => {
             pending('Convert existing form test here');
@@ -2649,17 +2646,12 @@ describe('igxCombo', () => {
                 expect(model.touched).toBeTrue();
                 expect(model.dirty).toBeFalse();
             }));
-            it('should have correctly bound focus and blur handlers', () => {
-                spyOn(combo, 'onFocus');
+            it('should have correctly bound blur handler', () => {
                 spyOn(combo, 'onBlur');
 
-                input.triggerEventHandler('focus', {});
-                expect(combo.onFocus).toHaveBeenCalled();
-                expect(combo.onFocus).toHaveBeenCalledWith();
-
                 input.triggerEventHandler('blur', {});
                 expect(combo.onBlur).toHaveBeenCalled();
-                expect(combo.onFocus).toHaveBeenCalledWith();
+                expect(combo.onBlur).toHaveBeenCalledWith();
             });
         });
     });

projects/igniteui-angular/src/lib/combo/combo.component.ts

@@ -1176,13 +1176,6 @@ export class IgxComboComponent extends DisplayDensityBase implements IgxComboBas
         }
     }
 
-    /** @hidden @internal */
-    public onFocus() {
-        if (this.collapsed) {
-            this._onTouchedCallback();
-        }
-    }
-
     /**
      * @hidden @internal
      */