bug#28844: 26.0.90; display-line-numbers-mode should call window-configuration-change-hook

[Eli Zaretskii <eliz@gnu.org>]

> From: Paul Rankin <hello@paulwrankin.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, 28844@debbugs.gnu.org
> Date: Mon, 16 Oct 2017 15:14:10 +1000
> 
> > To see if line numbers are present in a buffer (and to make it
> > compatible with older Emacsen), you should use something like:
> > 
> > (bound-and-true-p display-line-numbers)

Indeed, if the problem is with determining whether
line-number-display-width should be called, then bound-and-true-p is
the way.  Sorry I didn't realize this was the issue.

> Sweet, thanks! I’ve encountered another bug with this mode #28855, so I think until it gets its house in order, the best thing to go with is:
> (if (bound-and-true-p display-line-numbers) (display-line-numbers-mode 0))

So does this mean the issue in this bug report (which AFAIU was how to
set the window's display margins in a way that is sensitive to
display-line-numbers-mode) is resolved for you?  Or is there anything
else to be done about this?  (Bug#28855 is a separate issue, I will
respond to that there.)

Thanks.