With this, <up> and <down> move by visual lines through multline history
elements like the above example, and then <up> on the first line or
<down> on the last brings up the next history element.  But going back
and forth between history elements changes the goal-column when the
elements have different lengths.  In fact, the current implementations
of next-line-or-history-element and previous-line-or-history-element
have the same problem.  This can be prevented by setting goal-column: