Bug in vim by using the -u option

[Jérôme Avond <j.avond@public.axolys.fr>]

$ cat /etc/issue
Debian GNU/Linux 5.0 \n \l

$ apt-cache show vim
Package: vim
Priority: optional
Section: editors
Installed-Size: 1516
Maintainer: Debian Vim Maintainers
<pkg-vim-maintainers@lists.alioth.debian.org>
Architecture: i386
Version: 1:7.1.314-3+lenny2
Replaces: vim-common (<< 1:7.1-175+1)
Provides: editor
Depends: vim-common (= 1:7.1.314-3+lenny2), vim-runtime (= 1:7.1.314-3
+lenny2), libacl1 (>= 2.2.11-1), libc6 (>= 2.7-1), libgpm2 (>= 1.20.4),
libncurses5 (>= 5.6+20071006-3), libselinux1 (>= 2.0.59)
Suggests: ctags, vim-doc, vim-scripts
Conflicts: vim-common (<< 1:7.1-175+1)
Filename: pool/main/v/vim/vim_7.1.314-3+lenny2_i386.deb
Size: 776664
MD5sum: dd63be51e8deddf6425341aaa5f88ef5
SHA1: 8ebebf40b542cf909c62c2b88785d22c07f289c1
SHA256: 6c896ce4a6ecf8814b339029847f94cf8ab32f53db7787c7d742a929480e228b
Description: Vi IMproved - enhanced vi editor
 Vim is an almost compatible version of the UNIX editor Vi.
 .
 Many new features have been added: multi level undo, syntax
 highlighting, command line history, on-line help, filename
 completion, block operations, folding, Unicode support, etc.
 .
 This package contains a version of vim compiled with a rather
 standard set of features.  This package does not provide a GUI
 version of Vim.  See the other vim-* packages if you need more
 (or less).
Homepage: http://www.vim.org/
Tag: devel::editor, implemented-in::c, interface::text-mode,
role::program, scope::application, uitoolkit::ncurses, use::editing,
works-with::text, works-with::unicode


#################

Bug :

If i launch vim like this :

	$ vim 

Then i could use completion like this, eg:

: vn[tab]	gives me		: vnew

BUT if i launch vim like this :

	$ vim -u .vimrc

Then i could NOT use completion like this, eg:

: vn[tab]	gives me		: vn^I

It is very very very painfull when you get the habit of Tab-completion
and when you want to use the -u option for specific coding with extra
VIMRC file.