emacs -Q output.txt
M-x visual-line-mode
;; Scroll just after the long line of text in the middle of the screen,
;; then position the cursor at the first character at that visual line.
C-M-: (add-text-properties (point) (1+ (point)) '(invisible t))
next-line
recenter-top-bottom
previous-line

The cursor should jump to the top of the screen.  This isn't always the
case, as it sometimes moves to the bottom.  It seems to only happen when
the window needs to be repositioned.

As you may be able to tell from the output below, I'm running from the
emacs-25 branch.