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

[Gregory Heytings]

> I would add that unless you're seriously considering replacing narrowing 
> with my first-principles scheme (doubtful given how many hours you've 
> invested in narrowing), this is all an academic exercise in 
> oneupsmanship, which mind you, I am definitely game for.

My sole aim here is to improve Emacs, which is why I'm interested in all 
good ideas.  If it turned out that your scheme gives better results in 
some cases, I don't see why it couldn't be included in Emacs.  And if (but 
that seems less likely) it turned out that your scheme gives better 
results in all cases, I don't see why it wouldn't replace what is on 
master.

> If that suggests I believe I dealt with long lines better than you, 
> you'd be correct.

> From what I see, you are a competent programmer.  I find it regrettable 
that you turn this (and other discussions) into an ego quarrel.  As I 
already said, your contributions and ideas are welcome.