title: Emacs print margin column
body: <p>is there any way to show a <em>real</em> print margin at a specific column (e.g. 80), such that the background gets another color for columns above "n" or a solid line is shown at this column?</p>
  
  <p>I found <code>ColumnMarker</code> (see <a href="http://www.emacswiki.org/emacs/ColumnMarker" rel="nofollow noreferrer">here</a>), unfortunately, this addon only highlights text that is beyond the specified column.</p>
  
  <p>What I've also tried is changing the window/frame size of emacs to (w/h) = (80/). 
  Generally, this works pretty fine. Unfortunately, it doesn't under GNOME, if the emacs window/frame is maximized!</p>