bug in demo_showcandidates.py?

[askerlee]

When demo_showcandidates.py shows all the proposed bounding boxes, it calls:
55: painter.drawRect(x0, y0, x1, y1)
I guess here x1, y1 are the coordinate of the right-upper corner of the box?

But according to the document of QPainter.drawRect:
http://pyqt.sourceforge.net/Docs/PyQt4/qpainter.html#drawRect-2
QPainter.drawRect (self, int x, int y, int w, int h)
The last two parameters are width and height of the box.

So I guess the correct call should be
painter.drawRect(x0, y0, x1-x0, y1-y0)

Am I right? Thanks.