bug#33244: 27.0.50; buffer-local face-remapping not obeyed for the fringe

[Eli Zaretskii]

> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Fri, 02 Nov 2018 13:27:17 -0400
> 
> If I do:
> 
>     src/emacs -Q --eval "(face-remap-add-relative 'fringe '(:background 
> \"red\"))"
>     C-x 4 b *Messages*
>     M-x redraw-display
>     C-x o
>     M-x redraw-display
> 
> I see that Emacs redraws all the fringes with the same `fringe` face, that 
> which
> happens to be specified in the currently selected window, instead of
> correctly using for each window the `fringe` face adjusted to the
> face-remapping that happens to be active in the window's buffer.

Thanks, fixed.

Note that the solution necessarily makes redisplay a tiny bit slower,
especially when many windows need to be updated.