Partial-completion-mode recently broken

[Marshall, Simon]

In GNU Emacs 22.0.93.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2007-02-05 on perth
X server distributor `Hummingbird Ltd.', version 11.0.100015
configured using `configure  '--prefix=/rvcarma/marshals/software/slash/usr/local' '--with-x-toolkit=motif' 'CFLAGS=-g''

I did my weekly CVS update (I had to do a full "make bootstrap") and found a problem with partial-completion-mode.  Try:

src/emacs -Q

C-x C-f ~/fub TAB

Where ~/fubar is some existing directory.  Emacs completes it OK.  Quit and try:

M-x partial-completion-mode RET ; I see it loads advice, naughty?
C-x C-f ~/fub TAB

I see the following in the minibuffer:

Find file: fubar/

Emacs seems to have lost the prefix and operations subsequently fail.  I don't see any recent change to complete.el, but I don't have the time right now to dig into it.

Simon.

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