title: Autocomplete not working on all editor on mac os
body: <p>I'm using  OS X El capitan and i have problem with my code editor.<br>
  Autocomplete not working, popup dropdown does NOT show up.<br>
  I have tried in sublime text 2-3, atom, bracket, Xcode.<br>
  Press TAB is OK. But i want to show the popup dropdown.<br>
  Has anyone else experienced this or know what would have caused this? <br>Please help me.
  Tks.</p>