onFocus event emitting bug

[dm-gthb]

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Current behavior onFocus event isn't emitted when the input is focused using the tab key in case without any tags added. It fired with some added tags or focused by click, but it doesn't using the tab and without tags.

Expected behavior Event fired when the input is focused using the tab key either with existing tags list or empty.

Minimal reproduction of the problem with instructions (if applicable) Here when input is focused using the tab, onFocus won't be emitted and code in onInputFocused won't be executed:

@Component({
  selector: 'test',
  template: '<tag-input [(ngModel)]="items" (onFocus)="onInputFocused()"></tag-input>',
})
export class TestComponent {
  items = [];
  onInputFocused() {
    // code to execute
  }
}

What do you use to build your app?. Please specify the version angular-cli

Angular version: 8

ngx-chips version: 2.1.0

Browser: [Chrome 79 | Firefox 72 | Safari 13]