title: Duplicate the current line in octave
body: <p>Is there any Method to duplicate the one line of code in octave GUI. Like in eclipse if we want to duplicate a code of line such as:</p>
  
  <p>int a = 5;</p>
  
  <p>We can press Ctrl+Alt+Down to copy it to the next Line.
  So is there any shortcut to do this in octave GUI. </p>