title: Tooltips within ngx-datatable are partially hidden behind row borders
body: <p>Tooltips within an ngx-datatable are partially hidden behind row borders.</p>
  
  <p>I tried changing the z-index for <em>.tooltip-inner</em>. But it didn't had an effect.</p>
  
  <p>Any ideas why, how can it be fixed?</p>
  
  <p><a href="https://stackblitz.com/edit/angular-cvaq2e?file=app%2Fapp.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-cvaq2e?file=app%2Fapp.component.html</a></p>
  
  <p>Move over the Edit buttons, the tooltips are behind the row borders.</p>
  
  <ul>
  <li><strong>Table version:</strong> 11.2.0 with bootstrap theme</li>
  <li><strong>Angular version:</strong> 5.2.3</li>
  <li><strong>Browser:</strong> firefox, chrome</li>
  <li><strong>Language:</strong> TS</li>
  </ul>