RE: [External] : Make scroll-{up, down} move point to {start, end} of newly visible text

[Drew Adams]

Not exactly what you requested, but maybe one of these
will help:

1. `hl-spotlight-mode', in `hl-spotlight.el'

https://www.emacswiki.org/emacs/download/hl-spotlight.el

2. `crosshairs-mode', in `crosshairs.el'

https://www.emacswiki.org/emacs/download/crosshairs.el

(That one requires `hl-line+.el', same URL prefix.)

There are likely lots of libraries that offer ways to
focus on what you want to focus on, e.g., to keep track
of your reading.

Even plain `hl-line-mode.el' does that, to some degree.