There is an annoying bug in print_png (a'm using 1.1.0).
After saving figure it just stops redrawing on screen (gdk). It happens
because the print_png calls the set_pixmap method of the canvas renderer
which change the associated drawable forever. I'm using workaround saving
canvas._renderer.gdkDrawable and restoring it after print_png call. Woud be
nice to fix it in the upcoming release if possible.
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