bug#23570: 25.1.50; Cursor motion error with visual-line-mode

[Chong Yidong]

Eli Zaretskii <eliz@gnu.org> writes:

> the first word that wraps to the next screen line is followed by more
> than one whitespace character.  In your recipe, that would be the 2
> spaces in "ABCDEFGHIJK MOPQ".

Yes, the two whitespaces on the wrapped line seem to be necessary to
trigger the bug.

> I wonder what your real-life use cases where

I came across this while editing a LaTeX document, and the two white
spaces that triggered the bug were the usual two spaces after a full
stop.  I'd previously noticed the bug on a couple of occasions, sometime
after the Emacs 24.4 release, but didn't manage to get a reproducible
recipe until now.