`C-h f' and `C-h v' don't split window anymore?

[Zhang Wei]

`C-h f' and `C-h v' used to split window and give help information in
another window, why this behavior changed? Now it doesn't split window
anymore and gives help information in a window occupy the whole frame.

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please include the output from the following gdb commands:
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In GNU Emacs 22.1.50.1 (i386-mingw-nt5.1.2600)
 of 2007-07-17 on BREPHOME
modified by Zhangwei <address@hidden>.
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: CHS
  locale-coding-system: cp936
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  shell-dirtrack-mode: t
  gnus-topic-mode: t
  gnus-undo-mode: t
  auto-image-file-mode: t
  display-time-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  encoded-kbd-mode: t
  tooltip-mode: t
  mouse-wheel-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
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-p C-p a a v q <return> q C-x k C-k y e s <return> 
C-g g g <down> <down> v <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> q <down> <down> <down> <down> <down> <down> 
<down> v q q <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<up> <up> <up> v <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> v q <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
v q M-x d i <backspace> g <backspace> <backspace> g 
r e p <tab> <tab> - f i n <tab> C-a C-k C-g C-h f g 
r e p <return> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> q C-x k C-k C-g C-h f C-y <return> q C-x k C-k 
C-g C-x b C-s <return> <return> M-> C-r C-s v r e <backspace> 
<backspace> e r C-r s i o n C-r C-r C-r C-r C-r <return> 
C-h f <return> C-x 1 C-x b <return> <help-echo> <help-echo> 
<help-echo> M-x M-x C-x b <return> C-g <help-echo> 
C-x b C-s C-s C-s C-s <return> p p <return> <return> 
q <return> <return> q g M-x r e p o r t - e m <tab> 
<return>

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