title: Xcode 4: editing color of highlighted line
body: <p>In Xcode 4, how do I change the color of a line highlighted by error correction?</p>
  
  <p><img src="https://i.stack.imgur.com/esNsH.png" alt="example"></p>
  
  <p>In this example, the first highlighted line correctly uses the color set by the "Selection" option in "Fonts&amp;Colors", while the other one is highlighted clicking on its warning sign. How do I change that color?</p>