Directory name completion question for CVS Emacs

[Yoni Rabkin]

Hello, I'm running GNU Emacs 22.0.50.1 (i686-pc-linux-gnu) of
2005-07-12.

I have the following directory structure:

/home/trg/src/emacsen/emacsCVS/emacs/
/home/trg/src/emacsen/emacs21/emacs-21.4/

On the CVS Emacs (version listed above) I do the following:

1) C-x C-f ("~/" appears)
2) "sr" TAB (lone completion to "src/")
3) "em" TAB (lone completion to "emacsen/")
4) TAB (completes to "emacs21", and not "emacs") !!!

On GNU Emacs 21.4.1 (i686-pc-linux-gnu) I do the following:

1) C-x C-f ("~/" appears)
2) "sr" TAB (lone completion to "src/")
3) "em" TAB (lone completion to "emacsen/")
4) TAB (completes to "emacs", as I would expect).

Why does completion behave differently?

-- 
"Cut your own wood and it will warm you twice"
        Regards, Yoni Rabkin Katzenell