query-replace-regexp whitespace handling

[Michael Mauger]

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Please write in English if possible, because the Emacs maintainers
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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

running emacs -Q (very recent CVS)

;; load scratch with some text
C-x i ~/.emacs RET

;; run q-r-r the first time -- replace multiple 
;; spaces and tabs with a single tab
M-x query-replace-regexp RET
[ TAB SPC ] + RET
TAB RET

;; Do a couple of replaces and then quit out
y y q

;; run q-r-r the second time, the default looks good 
;; (default [^I ]+ -> ^I)
M-x query-replace-regexp RET
RET
y y q

;; one more time.  Oops what's up with the default? 
;; (default ^I -> ) replace tab with nothing
C-g

In GNU Emacs 21.3.50.1 (i386-mingw-nt5.0.2195)
 of 2005-02-04 
Distributor `Microsoft Corp.', version 5.0.2195
configured using `configure --with-gcc (3.3) --cflags -DMMAUG
-I/c/emacs/GnuWin32/include'

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
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  encoded-kbd-mode: t
  mouse-wheel-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
y y y y y y y y y y y <up> <prior> <prior> <up> <up> 
<up> <up> <up> <up> <up> M-x <up> <return> <return> 
y y y y y y y y y y y y y y y y y y y y y y <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<down> <down> <down> <help-echo> <down-mouse-1> <mouse-1> 
<wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> 
<triple-wheel-up> <wheel-down> <double-wheel-down> 
<triple-wheel-down> <triple-wheel-down> M-x e m a c 
SPC b SPC <backspace> SPC <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> r e p o r SPC SPC 
SPC <return>

Recent messages:
Loading help-mode...done
Quit [2 times]
Defining kbd macro...
No keyboard macro defined.
Quit [2 times]
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