bug#3619: Replace Rectangle can't do empty after first replace anymore

[w.goesgens]

till emacs V21 one could use C-x r t to flush a rectangle, since there was no 
sugestion of the last parameters to this action.
sinve emacs V22 theres 
String rectangle (default foobar): 
Now one can override foobar by a new text, but theres no way to get it do the 
same as C-x r k does, which is actualy convenient because one doesn't have to 
remember two commands.


In GNU Emacs 22.2.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-11-09 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' 
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' 
'--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim'
 '--with-x=yes' '--with-x-toolkit=athena' '--with-toolkit-scroll-bars' 
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g 
-O2' 'LDFLAGS=-g' 'CPPFLAGS=''

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: de_DE.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: SQL[ansi]

Minor modes in effect:
  delete-selection-mode: t
  pc-selection-mode: t
  which-function-mode: t
  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
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <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> <S-insert> <return> <up> <S-up> <S-up> 
<S-up> <backspace> <backspace> C-x C-s <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> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <down> 
<down> <down> <down> <down> <down> <down> <insert> 
<delete> <down> <down> <delete> <insert> <down> <down> 
<delete> C-x C-s <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> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <switch-frame> <help-echo> 
<help-echo> <switch-frame> <switch-frame> <help-echo> 
<help-echo> <switch-frame> <switch-frame> <help-echo> 
<switch-frame> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <switch-frame> <switch-frame> 
<switch-frame> <help-echo> <help-echo> <help-echo> 
<switch-frame> <switch-frame> <switch-frame> <switch-frame> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <switch-frame> 
<switch-frame> <switch-frame> <switch-frame> <switch-frame> 
<help-echo> <switch-frame> <help-echo> <help-echo> 
<switch-frame> <help-echo> <switch-frame> <switch-frame> 
<switch-frame> <help-echo> <help-echo> <switch-frame> 
<help-echo> <help-echo> <switch-frame> <switch-frame> 
<switch-frame> <down> <down> <down> <down> <down> <down> 
<down> <help-echo> <C-down-mouse-1> <up> <up> <up> 
<up> <up> C-SPC <up> <up> <up> <up> <right> <right> 
<right> C-x r t <help-echo> <help-echo> <down-mouse-1> 
<mouse-movement> <mouse-1> <double-down-mouse-1> <double-mouse-1> 
<triple-down-mouse-1> <triple-mouse-1> <help-echo> 
<help-echo> C-x <return> <return> <help-echo> <down-mouse-1> 
<mouse-1> <escape> <escape> <escape> <up> <up> <up> 
<up> <up> C-SPC <up> <up> <up> <up> <right> <right> 
<right> C-x r t <escape> <escape> <escape> C-x r k 
M-x b u g <tab> <tab> <backspace> <backspace> <backspace> 
r e p <tab> o <tab> r <tab> <return>

Recent messages:
Wrote /home/willi/wdev_update.txt [2 times]
Mark set [3 times]
Wrote /home/willi/wdev_update.txt [2 times]
line-move-1: Beginning of buffer [3 times]
Mark set
Quit
Mark activated
Quit
Making completion list... [2 times]
Loading emacsbug...done