title: Angular disable parent scroll when child is open
body: <p>I made a popup which appear when button in parent component is clicked. It have absolute position and 80% alpha, blured background. I would like to prevent parent scroll because this popup have 100% width and height and it doesn't look good when the background is shifting :P</p>
  <p>It looks something like this:</p>
  <pre><code>&lt;parent-component&gt; &lt;-- Disable scroll of this boy 
      &lt;child-popup *ngIf=&quot;some condition&quot;&gt;&lt;child-popup&gt; &lt;-- When this is open
  &lt;/parent-component&gt;
  </code></pre>