bug#29416: 26.0.90: display glitch

[Eli Zaretskii]

> Date: Thu, 23 Nov 2017 21:07:18 +0100
> From: charles@aurox.ch (Charles A. Roelli)
> 
> Using Ubuntu GNU/Linux and launching emacs -q on the pretest:
> 
> M-x find-function RET format-message RET
> M-x load-theme RET wombat RET
> C-5 C-v C-5 C-v
> 
> There are a few horizontal blue lines visible on the last line of:
> 
> > {
> >    return styled_format (nargs, args, true);
> > }
> 
> so that it looks a little like this instead:
> 
> > }                                        ___   _    ____ __

I don't see this on my system (which is not GNU/Linux).