bug#29711: 25.2; mode-line distortion when using :box on mac os

[charles@aurox.ch (Charles A. Roelli)]

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> From: Adam Simpson <adam@adamsimpson.net>
> Date: Thu, 14 Dec 2017 14:27:56 -0500
> 
> The below is with emacs -Q.
> Also, I left out a step, after step 2 move to the bottom of the document (M - >). The mode line will then become distorted. 
> 
> Apologies for the shoddy reporting.
> > On Dec 14, 2017, at 2:28 PM, Charles A. Roelli <charles@aurox.ch> wrote:
> > 
> >> From: Adam Simpson <adam@adamsimpson.net>
> >> Date: Thu, 14 Dec 2017 13:20:20 -0500
> >> 
> >> 
> >> 1. Paste and then evaluate the following in the *scratch* buffer:
> >> (set-face-attribute 'mode-line nil
> >>                    :foreground "white"
> >>                    :background "red" 
> >>                    :box '(:line-width 5 :color "red"))
> >> (setq-default mode-line-format (list 
> >>              '(:eval mode-line-position)
> >>              mode-line-modes))
> >> 2. Open a long file that has thousands of lines. I used ivy.el which is
> >> around 4k lines.
> >> 
> >> 3. Observe the mode-line is "distorted" like so: https://i.imgur.com/qxAsdfm.png
> >> 
> >> 
> >> 
> >> In GNU Emacs 25.2.1 (x86_64-apple-darwin16.6.0, NS appkit-1504.83 Version 10.12.5 (Build 16F73))
> >> of 2017-08-09 built on d12frosted.local
> > 
> > Doesn't happen here on macOS 10.6.  (For a "long file", I used M-x
> > find-library simple RET).  Could you please try from emacs -q?

Thanks.  I see "Bot L8984(Emacs-Lisp ElDoc)", as attached, but I don't
see where the problem is.


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