title: In RubyMine, how to preview a file's contents by selecting it like in Sublime Text?
body: <p>I'm new to RubyMine 7 on Mac.
  I used to use Sublime Text 3 and I love RubyMine so far except its lack of file previewing.</p>
  
  <p>In Sublime Text, when clicking a file in the sidebar (file explorer), the selected file content shows in an editor tab for temporary viewing.
  If I select another file, then the same tab changes to the content of the newly selected file.</p>
  
  <p>I've been searching for this preference setting in RubyMine, or in a plugin, but I've had no luck.</p>
  
  <p>A similar feature is "Autoscroll to source" but this feature opens files rather than previewing them.</p>
  
  <p>If anyone knows how to do Sublime Text-like file content previewing in RubyMine, I'd appreciate it.</p>