I notice that when generating several plots, they are
> cascaded upon one another, one slightly to the right and
> below of the previous one. However, when the plots get
> near the bottom of the screen, they keep cascading even
> when only the top of the plot can be seen. Should the
> cascading not reset when the *bottom* of a frame touches
> the bottom of the screen, and not the top?
> Also, when the previous plot disappears prior to the
> current plot, is there any need to cascade them at all?
> Currently, the plots cascade even when prior plots have
Me thinks this is backend dependent behavior, since we don't do
anything explicit here we fall back on the default behavior for each
backend. Backend dependent patches welcome!