title: What does "Keep Index" option of Git stash dialog in Intellij IDEA do?
body: <p>It is said in <a href="https://www.jetbrains.com/help/idea/2016.2/stash-dialog.html" rel="noreferrer">IDEA documentation</a></p>
  
  <blockquote>
    <p>Select this check box to have IntelliJ IDEA bring the changes staged in the index to your working tree for examination and testing.</p>
  </blockquote>
  
  <p>Can somebody please explain what does this mean?</p>