title: Set alignment for one member in the stackView
body: <p>I have a stack view that contains three item, 2 labels (one of them in the left side and another one in the right side), and one view as a separator in the middle. 
  How the configuration of the stackView should look like that the separator has a left alignment.
  I mean the separator should stay closer to the left item than the right one. </p>
  
  <p>your help will be appreciated. </p>