title: Eclipse Luna splits editor on tab click. How to disable?
body: <p>I moved from eclipse Kepler to eclipse Luna a few weeks ago. And it works quite nicely, i hardly notice the change which is a good thing.</p>
  
  <p>The only thing that bugs me is that sometimes when i click on a file tab the editor goes into split mode. It only happens rarely, i suspect I'm doing some mouse gesture which splits the editor.</p>
  
  <p>Is it possible to turn this mouse gesture off, or if it isn't a mouse gesture: is it possible to disable the splitting feature?</p>