title: git p4 - Author of file changes are overwritten by user who integrated file
body: <p>I am converting my Perforce depot into a git repo by using <strong>git p4</strong>. With the help of answers in other questions I got it managed to copy over the history and integrations successfully.</p>
  
  <p>Unfortunately the line history in files only refers to the person that made the integrate to the <code>master</code> branch, and not from where it came from. Example:</p>
  
  <pre><code>//depot/main/foo.txt
  //depot/branch1/foo.txt
  </code></pre>
  
  <p>A user <code>foo</code> modifies foo.txt in <code>branch1</code>. Another user with the name <code>admin</code> performs the integrate to <code>main/foo.txt</code>.</p>
  
  <p>In the file history of <code>main.txt</code> it states that <code>admin</code> performed the modification, but actually it was <code>foo</code>. Is there any way to activate this backtrace to distinguish between committer and author of modifications?</p>