changing directory in shell invalidates path completion with <TAB>

[damian347@op.pl]

Hallo
what I do:
1) M-x shell - it invokes shell
2) user$ cd /tmp
3) fil<TAB> - does not autocomplete to file.txt (this file exists for sure)

Note that when I run emacs without emacspeak module, everything is ok.

some notes about versions:
emacspeak-version's value is "22.0"
emacs-version's value is "21.3.1"

Note on where is the possible problem:
changing directory in emacs without emacspeak also changes `default-directory' variable to the new directory, while in emacs + emacsspeak it remains unchanged.

Greetings
damian

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