10x20 Font not found

["Robert J. Chassell" <bob@rattlesnake.com>]

    -misc-fixed-medium-r-normal--20-200-75-75-c-100-iso8859-1

is not found when I invoke `mouse-set-font' with S-down-mouse-1
although x-fixed-font-alist lists
    -misc-fixed-medium-r-normal--20-*-*-*-c-100-iso8859-1
in /usr/local/src/emacs/lisp/mouse.el

     ("10x20" "-misc-fixed-medium-r-normal--20-*-*-*-c-100-iso8859-1" "10x20")

Instead, I receive an error message that says

    mouse-set-font: Font not found

The surrounding fonts, 9x15 and 11x18, are found as

  -thai-fixed-medium-r-normal--16-114-100-100-p-100-tis620-0

  -Misc-Fixed-Medium-R-Normal-ko-18-120-100-100-C-180-ISO10646-1

(the exact fonts are peculiar -- why should
     ("9x15" "-misc-fixed-medium-r-normal--15-*-*-*-c-90-iso8859-1" "9x15")
be thai and 16? -- but they are found).

The following succeed:

 rxvt -fn "-misc-fixed-medium-r-normal--20-200-75-75-c-100-iso8859-1" -cr black
 xterm -fn "-misc-fixed-medium-r-normal--20-200-75-75-c-100-iso8859-1" -ah
 xlsfonts -fn "-misc-fixed-medium-r-normal--20-200-75-75-c-100-iso8859-1"

On 2008 Feb 18, I could again see the 10x20 font which had vanished at
the time of the unicode merge but I have not be able to see it since
2008 Mar 5.

In today's GNU Emacs CVS snapshot, Tue, 2008 Mar 25  10:24 UTC
GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
built with

    make distclean
    autoconf
    ./configure --with-x --with-type1 --with-x-toolkit=gtk
    make bootstrap

started with

     /usr/local/src/emacs/src/emacs -Q -nbc

--
    Robert J. Chassell                          GnuPG Key ID: 004B4AC8
    bob@rattlesnake.com                         bob@gnu.org
    http://www.rattlesnake.com                  http://www.teak.cc