bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus

[Eli Zaretskii]

> Cc: kaushal.modi@gmail.com, 27647@debbugs.gnu.org,
>  jonaswestlund101@gmail.com, npostavs@users.sourceforge.net
> From: Romanos Skiadas <rom.skiad@gmail.com>
> Date: Fri, 13 Oct 2017 19:14:10 +0100
> 
> >> It is indeed a GTK3 build and setting x-gtk-use-system-tooltips to nil 
> >> does indeed make this problem go away.
> > What about disabling scroll-bar-mode, while leaving the GTK tooltips
> > in use -- does that also make the problem go away?
> >
> > Thanks.
> Just checked, still shows up with scroll-bar-mode disabled and the 
> tooltips in use.

What if you turn on display-line-numbers globally -- does the problem
persist in that case with your default settings for GTK tooltips?