Sorry Corday,
this is a bug.
if the end of the line is reached, scrolling must stop.
it does stop with the slider, but it does not stop with the arrow.
this has nothing to do with word wrap, which is disabled.
try the same thing in notepad, and you will see how it has to work correctly.
in notepad both, slider and arrow stop scrolling, when the end of the line has been reached.
cheers mike