title: GitHub PR showing no differences, but files are different
body: <p>If I have a file that's different in a sub-branch and is different from the same file in the master branch, but supposedly they are synced up with commits. How do I take the updated file and merge it into the master branch?</p>
  
  <p>Using my own repo <a href="https://github.com/u2berggeist/csv2cash" rel="nofollow noreferrer">csv2cash</a>, I have a branch called <code>translations_ignore</code>. It has an updated <code>README.md</code> file in it. I want to merge it into the <code>master</code> branch.</p>
  
  <p>If I open a pull request though, it says all the commits are synced. The <code>master/README.md</code> and the <code>translations_ignore/README.md</code> are quite different though.</p>
  
  <p>I know there's a difference between commit being up to date and files being the same, but I'm still really confused as to what's going on.</p>
  
  <p>Also, if I try to do a PR the reverse way (merge <code>master</code> into <code>translations_ignore</code>), then it then recognizes the changes in files.</p>
  
  <p>Edit: for future reference, I've tagged the state of the <code>master</code> and <code>transaction_ignore</code> branches <a href="https://github.com/u2berggeist/csv2cash/releases/tag/StackExchangeQ" rel="nofollow noreferrer">here</a> and <a href="https://github.com/u2berggeist/csv2cash/releases/tag/StackExchangeQ2" rel="nofollow noreferrer">here</a> respectively.</p>