bug#45799: 28.0.50; Faces shrink unreadable on GUI when foreground/background color set in TUI

[Eli Zaretskii]

> From: Jean Louis <bugs@gnu.support>
> Date: Mon, 11 Jan 2021 22:44:08 +0300
> 
> When I use `emacsclient -c -nw' for `customize-faces', `default' and
> unset foreground and background color, the GUI faces shrink to miniscule
> sizes that I cannot even read any more.

Don't do that: Customize changes the faces globally, not only for the
frame where you do it.  It's the wrong tool if you want to customize
faces on some frames, but not others.  Use set-face-foreground and its
ilk.