title: NSImage drawInRect:fromRect:operation:fraction results in a flipped image
body: <p>When I use:</p>
  
  <pre><code>[iconImage drawInRect:NSMakeRect(cellFrame.origin.x+5,yOffset+3,cellFrame.size.height-6, cellFrame.size.height-6)
                       fromRect:NSMakeRect(0,0,[iconImage size].width, [iconImage size].height)
                      operation:NSCompositeSourceOver
                       fraction:1.0];
  </code></pre>
  
  <p>to draw some images in the NSOutlineView cells, the images are vertically flipped upside down. How can I fix it ?</p>
  
  <p>Thanks</p>