bug#3447: suggest minibuffer M-< go to start of text

[Kevin Ryde <user42@zip.com.au>]

In the minibuffer it'd be good if M-<, currently `beginning-of-buffer',
went to the start of the editable text rather than the start of the
prompt.  The start of editable text would match what C-a
`move-beginning-of-line' now does.

Dunno if it'd be best to have a function recognising "field" stuff, or
just a different keybinding in the minibuffer.  I've been using the
couple of lines below.  It's good when you've got a multiple lines in
the minibuffer.


(defun my-minibuffer-beginning-of-buffer ()
  (interactive)
  (or (and (fboundp 'region-active-p) ;; new in emacs23
           (region-active-p))
      (push-mark))
  (if (<= (point) (minibuffer-prompt-end))
      (goto-char (point-min))
    (goto-char (minibuffer-prompt-end))))
(define-key minibuffer-local-map "\M-<" 'my-minibuffer-beginning-of-buffer)




In GNU Emacs 22.3.1 (i486-pc-linux-gnu, GTK+ Version 2.14.7)
 of 2009-03-31 on raven, modified by Debian
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/22.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.3/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.3/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--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: en_AU
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t