title: Android studio automatically open's documentation view
body: <p>I don't know if it is bug or kind of setting, but it is very annoying while typing value i.e.   <code>android:layout_gravity=""</code>, it opens hints with dropdown, and after a while the documentation view gets opened and hides the dropdown with hints. </p>
  
  <p><img src="https://i.stack.imgur.com/0cuA0.png" alt="enter image description here"></p>
  
  <p>I checked that no button is suspended or anything like that. I use Ubuntu 14.04.</p>