On Thu, Oct 5, 2017 at 4:47 AM Eli Zaretskii <eliz@gnu.org> wrote:
It's definitely not for NEWS.

I agree, as I later realize that this was in 25.1 too, just that it wasn't noticeable with nlinum enabled.
 
  As for PROBLEMS, can one of you suggest
the wording we'd like to put there?  It's hard for me to make a
decision with no description of the workaround in sight.

I would suggest this:

For a window sharing its left edge with another window, the left side of the fringe in that edge gets truncated if scroll-bars are disabled. A workaround is to enable the right-side window-dividers by doing (window-divider-mode 1), and customizing the divider width (window-divider-default-right-width) and face (window-divider) as needed.

This image[1] summarizes the problem.

Here is my workaround[2] for reference.

[1]: https://debbugs.gnu.org/cgi/bugreport.cgi?att=2;msg=17;bug=27830;filename=image.png

[2]: https://github.com/kaushalmodi/.emacs.d/commit/ea60f986d58b27f45d510cde1148bf6d52e10dda

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Kaushal Modi