bug#32975: Emacs 26.1; GTK Warnings

[Eli Zaretskii]

> From: Tjernlund <tjernlund@tjernlund.se>
> Cc: 32975@debbugs.gnu.org
> Date: Tue, 09 Oct 2018 20:33:45 +0200
> 
> > > > Do the problems go away if you disable the scroll bars?
> > > 
> > > The left side scroll bar?
> > 
> > All of them.
> > 
> > > Don't know howto do that ..
> > 
> > "M-x scroll-bar-mode RET" should toggle display of vertical scroll
> > bars.  "M-x horizontal-scroll-bar-mode RET" should do the same with
> > horizontal scroll bars.
> 
> They only happen one at startup, if if put in my .emacs:
>    (scroll-bar-mode 0)
> They are gone.

Great, then my guess was correct.  These warnings come from
xg_update_scrollbar_pos and from xg_finish_scroll_bar_creation.  Can
some GTK expert try to find out why the scroll-bar widget seems to be
reported as invalid)?  Robert, are you there?

Thanks.