Emacs 24.3 wrong default face font in new frames

[Barry Warsaw <barry@python.org>]

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The current in-development versions of Debian and Ubuntu recently got updated
to Emacs 24.3 from 24.2.  This broke one of my very long-standing
customizations.

It's entirely possible that I'm doing something stupid in my .emacs files, but
maybe it's a known bug.  I can certainly fix my own code in the former case,
but if it's the latter, and there's a fix available in Emacs vcs, I'll cherry
pick a patch for those two distros.

Specifically, I set a font for the default face and it shows up fine in the
initial frame for both 24.2 and 24.3.  It also shows up fine in new frame
(C-x 5 2) but *only* for 24.2.  In 24.3, I get the wrong font.

Here are some code excerpts.  My default face is customized:

...
(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(default ((t (:inherit nil :stipple nil :background "Grey27" :foreground "LightCyan" :inverse-video nil :box nil :strike-through nil :overline nil :underline nil :slant normal :weight normal :height 115 :width normal :foundry "unknown" :family "Monospace"))))
 ...

But I also set it in (essentially) my .emacs file:

  (set-face-attribute 'default nil
                      :family "Ubuntu Mono"
                      :height 120)

In the initial frame with both Emacsen, and on new frames in 24.2, my default
face is indeed Ubuntu Mono, as shown by C-u C-x =

...
    xft:-unknown-Ubuntu Mono-normal-normal-normal-*-16-*-*-*-m-0-iso10646-1 (#x2C)

In new frames on 24.3 however, the font is wrong:

    xft:-unknown-DejaVu Sans Mono-normal-normal-normal-*-16-*-*-*-m-0-iso10646-1 (#x2C)

What's going on?  Is it me or is it Emacs? ;)

Cheers,
-Barry

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