In the web interface, when I am looking at the temperature plot, zoom with a mouse to a shorter duration, all is still well. When I want to see the humidity during that shorter duration, the plot is unzoomed back to the preset level for both x and y.
I understand that figuring out the expected y-level zoom for another variable is difficult, and I do not know how it would look if only the time-level zoom were be kept, but I know that every time both zoom levels are reset when I change the plotted entity, I am not happy.