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Matplotlib interactive plotting pads figure size

With interactive backend (eg Tk)


f = pylab.figure(figsize = (7,10))
f.get_size_inches() -> array([  7.175,  10.175])


The saved pdf is also of this size.

It becomes extreme with smaller figures:


f = pylab.figure(figsize = (1,1))
f.get_size_inches() -> array([ 3.275,  1.175])


This last I can see as a function of getting the tool bar to fit.

With Agg the saved figure is the size you ask for
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