bug#16306: 24.3.50; font change creates blank column on Lucid

[YAMAMOTO Mitsuharu]

Steps to reproduce:

  1. $ emacs -Q &
  2. (set-frame-font "Courier-18") C-j

Then a blank column is created on the right edge of the frame (i.e.,
to the right of the right fringe).

I can reproduce it if Emacs is compiled with the Lucid widgets
support, but not for GTK+ or non-toolkit builds.

                                     YAMAMOTO Mitsuharu
                                mituharu@math.s.chiba-u.ac.jp

In GNU Emacs 24.3.50.1 (i386-apple-darwin13.0.0, X toolkit, Xaw3d scroll bars)
 of 2013-12-31 on YAMAMOTO-no-MacBook-Air.local
Bzr revision: 115814 dancol@dancol.org-20131230232707-q2l921i5t5m0et5d
Windowing system distributor `The X.Org Foundation', version 11.0.11404000
Configured using:
 `configure --with-jpeg=no --with-gif=no --with-tiff=no'