title: how can I stage a single line in SmartGit?
body: <p>I want to stage a single line in SmartGit, rather than a whole diff hunk.</p>
  
  <p>Eg:</p>
  
  <pre><code>old line
  new line but leave unstaged
  new line, just stage this
  new line but leave unstaged
  new line but leave unstaged
  old line
  </code></pre>
  
  <p>This is doable with GitX on OS X but on SmartGit the smallest unit I appear to be able to stage is a whole set of diff lines.</p>