> >    We would also like the histogram view to be unaffected by refreshing. 
> > Currently the y axis is autoscaled after a refresh.
> 
> I thought this was fixed a long time ago...

Never mind that.

Vertical scale of online histograms *has* to change after a refresh- the number of
counts in an online histogram increases as it accumulates more data and the histogram
would grow up out of the visual range unless it is rescaled.

Now, we can be smart about this: for a zoomed histogram, we can freeze the "y" scaling
or we can maintain the zoom ratio while rescaling.

K.O.