title: Validator Error is removed in Angular Forms
body: <p>I am trying to do two types of validations. </p>
  
  <pre><code>this.form= new FormGroup({
        initial: new FormControl (null, Validators.max(5))
  });
  </code></pre>
  
  <p>If initial has a error because is less than 5 and I want to add a new error with:</p>
  
  <pre><code>setErrors({ 'customError': true });
  </code></pre>
  
  <p>The validator error is removed and it is only showed the custom error.</p>
  
  <p>Could you help me?</p>
  
  <p>Thank you so much.</p>