bug#36288: 27.0.50; Cannot use menu-set-font

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Thu, 20 Jun 2019 10:32:34 +0200
> Cc: 36288@debbugs.gnu.org
> 
> I tried a different variant:
> 
> (add-to-list 'default-frame-alist '(font-backend x xfthb))

Where did you put this?  In the init file? or just evaluated it after
Emacs started?  In the latter case, it will be in effect only for
frames created henceforth.