title: vimdiff and move among left and right pane
body: <p>I am using <code>vimdiff</code> for the first time. Online I found written that to move from the left pane you use <code>CTRL + w + Left or right arrow</code><br>
  This does not work for me. But I see that if I press just <code>CTRL + w</code> and press <code>w</code> for a sec and let it go, it switches pane after ~500ms.<br>
  Is this how it is supposed to work? Am I doing something wrong?</p>