title: Vim GitGutter deletes unstaged hunks
body: <p>I'm having some weird problems with my <a href="https://github.com/airblade/vim-gitgutter" rel="nofollow">GitGutter</a>.
  If I have added some lines to my code:</p>
  
  <pre><code>1 oldline1
  2+newline1
  3+newline2
  4 oldline2
  </code></pre>
  
  <p>and then I close the file (wq) and reopen it. it looks like this:</p>
  
  <pre><code>1 oldline1
  2+---- 2 lines: newline 1-----------------------
  4 oldline2
  </code></pre>
  
  <p>Why is it doing this and how can I prevent/resolve this problem in the future?</p>
  
  <p>Thanks in advance for any tips!
  Edvin</p>