bug#2885: 23.0.92; Cannot customize tootip font

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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I don't like the default size of the font used by tooltips, so I
customize it to a smaller size by the following expression in my
~/.emacs:

  (setq tooltip-frame-parameters
		'((name . "tooltip")
		  (internal-border-width . 2)
		  (border-width . 1)
		  (font . "-*-*-light-r-*-*-10-*-*-*-*-*-*")))

This copies all the default parameters from tooltip.el, but adds a
font specification to the alist.

In Emacs 23, this doesn't seem to work, though: if you evaluate the
above expression in "emacs -Q" and move the mouse pointer to some
tool-bar button, you will see that the first tooltip is popped using
the smaller font, but the next and all the following tooltips somehow
revert to using the original font.

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
d:/gnu/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.92.1 (i386-mingw-nt5.1.2600)
 of 2009-04-04 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

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: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <help-echo> C-y C-j <help-echo> M-x r e 
p o r t - e m <tab> <return>

Recent messages:
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