title: Angular form invalid with valid controls
body: <p>I'm creating a from group with existing values:</p>
  
  <pre><code>this.form = new FormGroup({
    field1: new FormControl(
      {
        value: obj ? obj.value : null,
        disabled: obj
      },
      Validators.required
    ),
    field2: new FormControl(
      {
        value: obj ? obj.value : null,
        disabled: obj
      },
      Validators.required
    )
  });
  </code></pre>
  
  <p>reproduction: <a href="https://stackblitz.com/edit/angular-aadkss" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-aadkss</a></p>
  
  <p>I want it to when obj exists to fill the values, to be valid and disabled, but it is filling the values, being disabled and invalid, not valid. How can I make it valid?</p>