bug#10085: 24.0.91; completion-pcm--find-all-completions returns wrong remote file names

[Michael Albinus]

Start "emacs -Q". Apply "C-x C-f /sudo:: TAB". This results in
"/sudo:sudo:root@". A correct expansion would be "/sudo:root@".

As far as I can see, Tramp's completion functions work properly. The
problem seems to be `completion-pcm--find-all-completions'.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/home/albinus/src/emacs/etc/DEBUG.


In GNU Emacs 24.0.91.8 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.6)
 of 2011-11-19 on detlef
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
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: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC <down-mouse-1> 
<mouse-1> <prior> <prior> <down-mouse-1> <mouse-movement> 
<mouse-movement> <drag-mouse-1> <help-echo> <help-echo> 
<down-mouse-1> <mouse-1> q C-x C-f / s u d o : : <tab> 
c <help-echo> <help-echo> <down-mouse-3> <mouse-3> 
<down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> 
<down-mouse-1> <mouse-1> <escape> x r e p o r t C-x 
u <escape> x r e p o r t <tab> <return>

Recent messages:
Result: ("sudo:sudo:root@")

Result: ("sudo:sudo:root@")

Result: nil
Back to top level.
Continue...
Tramp: Opening connection for root@sudo using sudo...done
let*: Command attempted to use minibuffer while in minibuffer
Undo!

Load-path shadows:
None found.

Features:
(shadow sort mail-extr message rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev
mail-utils gmm-utils mailheader emacsbug derived easy-mmode cl-specs cl
edebug debug vc-bzr find-func help-mode easymenu view tramp-cache
warnings trace tramp-sh tramp tramp-compat auth-source eieio byte-opt
bytecomp byte-compile cconv macroexp assoc gnus-util mm-util mail-prsvr
password-cache shell pcomplete comint ring format-spec advice help-fns
advice-preload tramp-loaddefs regexp-opt time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer loaddefs button faces cus-face files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)