** When you type a long line in the minibuffer, and the minibuffer<BR>
shows just one line, automatically scrolling works in a special way
that shows you overlap with the previous line of text.  The variable
minibuffer-scroll-overlap controls how many characters of overlap
it should show; the default is 20.
<P>
Meanwhile, Resize Minibuffer mode is still available; in that mode,
the minibuffer grows taller (up to a point) as needed to show the whole
of your input.
<P>