title: Update row column without collapse rowDetail in ngx-datatable
body: <p>I use ngx-datatable to create a table with rowDetail in my Angular5 app.</p>
  
  <p><a href="https://stackblitz.com/edit/angular-yvwhus?file=app%2Fapp.component.ts" rel="nofollow noreferrer">Example code here</a></p>
  
  <p>There is a button call "Austin growup" , after clicking , the Austin's age will change and update table through <code>this.rows = [...this.rows]</code> in function <code>updateTable()</code>.</p>
  
  <p>But when I click button after expanding the detail row, the table will refresh and collapse all the rowDetail.</p>
  
  <p>I think the problem is <code>this.rows = [...this.rows]</code>. I believe that will refresh whole table.</p>
  
  <p>so...is there any way to dynamically update one row's value without collapse rowDetail (or without whole table refresh).</p>
  
  <p>Any suggestion will be help, thank you.</p>