title: tableview constraints to optimal window width
body: <p>I am working with swift 4 for macOS and have trouble with constraints in my NSTableView.</p>
  
  <p>I have this tableview:</p>
  
  <p><a href="https://i.stack.imgur.com/Lq0cs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lq0cs.png" alt="enter image description here"></a></p>
  
  <p>You can see, that my textfields not use the complete width of my tableview. I would like to fill the complete width with my textfields, but only the red textfield should get a larger width like this:</p>
  
  <p><a href="https://i.stack.imgur.com/5Kja3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5Kja3.png" alt="enter image description here"></a></p>
  
  <p>But it doesn't work yet :(
  Example: <a href="https://drive.google.com/open?id=0B8PBtMQt9GdORE1xSUUxeVFaWVU" rel="nofollow noreferrer">https://drive.google.com/open?id=0B8PBtMQt9GdORE1xSUUxeVFaWVU</a></p>
  
  <p>Can anybody help me?</p>