Normally, the x-axis interval [xmin,xmax] displayed in a window is set by the
user in in dialogs or menus. However, when data points are added periodically
to a file, it may be useful to adjust the interval automatically when the last
point falls out of the current [xmin, xmax]. This can be done by activating
auto x-scrolling.
Auto x-scrolling can be activated in several ways: