title: Writing a file with vim doesn't fire a file change event on OS X
body: <p>I am using <a href="https://github.com/gorakhargosh/watchdog" rel="noreferrer">watchdog</a> to monitor .less file change events on OS X. If I change the contents of a .less file with TextMate or Sublime Text the modification event is captured. However, if I edit the content with vim no file modification event is fired (but file creation events for files created with vim are captured). I have seen the same behaviour with FSEvents and kqueue (both of which I have practically zero knowledge of).</p>
  
  <p>I wonder can anybody explain this behaviour?</p>