Sometimes the scroll bar at the bottom of the window indicates that there is a very long
line somewhere, but a visual scan scrolling from top to bottom of the file doesn't
show any line going beyond (or even near) the right edge of the window. This isn't a
show stopper of course, but it would be nice to have a command of the form "select
the longest line in the file and scroll to show it". Is there such a thing? If not,
is there an easy way to add on a user tool to do the trick?