title: Get the actual geometry of a gnome-terminal
body: <p>in X I know you can get the geometry of a window with <code>xwininfo</code>.</p>
  
  <p>Unfortunately, if i retrieve such geometry from a gnome-terminal and use that to start another one with <code>gnome-terminal --geometry ...</code>, the two windows' top and left don't match.</p>
  
  <p>Indeed, the new terminal is south-east shifted by the width and height of the old terminal's window decoration.</p>
  
  <p>How can I start a new terminal that completely overlaps a first one?</p>