bug#2433: 23.0.90; [DOC] Sec.21, Command Loop, does not describe undo-related behaviour.

Section 32.9 "(Elisp)Undo" briefly describes that the command loop
creates an undo-boundary before a key sequence is executed.

Section 31 "(Elisp)Command Loop" does, however, not elaborate on
that. In fact, it does not mention undo-related behaviour at all.  In
particular, it's not mentioned where exactly the undo-boundary is
pushed onto the undo-list.

In GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-03-19 on vernadsky, modified by Debian
 (emacs-snapshot package, version 1:20080228-1ubuntu1)
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.0.60/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--enable-font-backend' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' '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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  tooltip-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-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<return> d d d d d d d <return> <up> <return> <down> 
<return> <down> <return> <down> <down> <return> <up> 
<return> <up> <down> <down> <down> <return> d <return> 
<return> <down> <return> <down> d d d d <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <down> <return> <down> <return> <down> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <down> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <down> <return> <down> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<down> d <return> <down> <return> <down> d d <return> 
<down> <return> <down> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <down> <return> <down> <up> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <down> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <down> d <return> > <down> 
<return> > <down> d d d d d d d d <up> <return> <down> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <down> <return> <down> <return> 
<down> <return> <down> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> q g <down> <down> <down> <down> <down> <down> 
<down> M-x r e p o r t - e m <tab> <return>

Recent messages:
Opening nnimap server on [email protected]
Reading active file from news.gmane.org via nntp...
Opening nntp server on news.gmane.org...done
Reading active file from archive via nnfolder...done
Checking new news...done
Auto-saving...done
Composing main Info directory...done
uncompressing elisp.gz...done
uncompressing elisp-1.gz...done
uncompressing elisp-4.gz...done

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