bug#57669: 29.0.50; C-n, C-p off under long lines

[dick]

> feel free to describe what your code actually does, with enough
> details for me and others to understand where I'm wrong.

I find it asymmetric you can denigrate Commercial Emacs on a public
forum without doing the research or showing a minimal reproducible
example, and that I must go out of my way to fight a presumption of
guilt.

Then again, I'm constantly slamming you for incompetence, so I guess
all's fair in this sad, pathetic war over not money, not fame, but
being right on the internet (cue xkcd cartoon).