The auto scale Y active function resets the view port of the current
active object along the y-axis and re-scales just the active object
in a way, that the maximum y-axis range is visible again. All other axes remain unchanged. Whenever the user wants to see the full data range along
the y-axis of the current active object, e.g. after he has zoomed into a particular data objects area to see details, he might apply this function.
All other objects, which might be also available in the current data view, are ignored for re-scaling. If you like to re-scale the view port
to fit all objects again, please use the auto scale Y function.