title: Spyder: refresh existing plot window instead of opening a new one
body: <p>I want to show plots in a separate window. Currently I have the IPython graphics backend set to "automatic". </p>
  
  <p>When I re-run the code (or plot another figure), Spyder opens a new plot window. Is it possible to refresh the figure in the window that is already opened instead of opening a new one?</p>