title: How to set relative position (oCoords) in FabricJs?
body: <p>I have a Text in fabricJs. I set top and left.
  This sets the aCoords properly to those values.
  However the oCoords dont match. And the Text is not displayed at the right position.</p>
  
  <p>I suspect that I need to set to oCoords somehow. So that the Text is displayed at the right pixel coordinates (top &amp; left) on the canvas.</p>