tab widths change when font size changes

[Eric Hanchrow]

Symptoms:

I started Emacs like this:

./src/emacs -Q -fn '-*-Bitstream Vera Sans Mono-Medium-r-*-*-15-*-*-*-*-*-*-*' 
/tmp/stats 

I maximzed it by clicking the window manager's "maximze" button.

I noticed that the columns weren't lined up -- for example, in the
second-to-last column, whose entries are the word "bignums", the word
"bignums" in the last row appears seven characters to the left of the word 
above it.

But start emacs with almost the same command line, but a different size of the 
same font, like this

./src/emacs -Q -fn '-*-Bitstream Vera Sans Mono-Medium-r-*-*-16-*-*-*-*-*-*-*' 
/tmp/stats 

(i.e., 16 instead of 15)

... and the columns all line up as I expect.

If emacs crashed, and you have the emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/src/emacs-cvs/etc/DEBUG for instructions.


In GNU Emacs 22.0.50.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2005-12-10 on debian
X server distributor `The XFree86 Project, Inc', version 11.0.40300001
configured using `configure '--enable-maintainer-mode''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  auto-compression-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
M-x r e p o r t - e m a c s - b u <tab> <return>

Recent messages:
(./src/emacs -Q /tmp/stats)
For information about the GNU Project and its goals, type C-h C-p.
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done

stats
Description: stats

-- 
If there were a little guy running around inside the computer
executing our programs, he would probably have as long and
plaintive a tale to tell about his job as a federal government
employee.
        -- Paul Graham