bug in CVS gtk-agg? doesn't return from gtk.main() when window is closed

John, I updated from CVS, made a one-line change to

    > contour.py to add alpha support, and tested using
    > contour_demo.py from bash shell--and found that with linux
    > default gtk-agg backend, the gtk.main() doesn't return when
    > the plot window is closed. I have to Ctl-C to get out.

Steve's recent change should fix your problem -- it was my bad.