title: Angular Material MatChipList MatError not visible when setting errorstate without focus
body: <p>I had some trouble displaying a mat-error on a chiplist. According to <a href="https://github.com/angular/components/issues/11260" rel="nofollow noreferrer">this GitHub issue</a> the <code>errorState</code> should be set explicitly to show the mat-error.</p>
  <p>This solution works fine, but only when the chiplist has focus. It does not work when the chiplist is not focussed. See <a href="https://stackblitz.com/edit/angular-matchiplist-with-error-message-z5fsfe?file=app%2Fchips-input-example.ts" rel="nofollow noreferrer">this example</a>. In my case, the list of valid fruits changes later on due to some API call when the chiplist has no focus.</p>
  <p>How can I show the mat-error when the chiplist has no focus?</p>