[Image-SIG] PIL thumbnail method

[Michał Swat]

Hi, I think there is a bug in thumbnail() method in PIL library.
In line 1533 is:
self.size = size

in my opinion this should be:

self.size = im.size

becouse now after calling thumbnail() method on an image object when I
want get dimentions of image(size property) i still gets old values,
exactly the same like before thumbnail() calls.Realy should be like
that?

Michal