title: How to exit a git difftool list in terminal?
body: <p>e.g.</p>
  
  <p>file <code>f1</code>, <code>f2</code> and <code>f3</code> changed, after press <code>git difftool</code>, git would diff the <code>new f1</code> and <code>old f1</code>. </p>
  
  <p>How to exit <code>git difftool</code>? </p>
  
  <p>the <code>:qa</code> just exit <code>diff old.f1 new.f1</code> only. but I don't want diff file <code>f2</code> and <code>f3</code>.</p>
  
  <p>my .gitconfig:</p>
  
  <p><code>[diff]
        tool = vimdiff</code></p>