pwd or shell prompt doesn't update after renaming a parent dir

[Ali Ghanavatian]

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2
-Wall
uname output: Linux dark-star 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16
14:04:26 UTC 2009 i686 GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 4.0
Patch Level: 33
Release Status: release

Description:
    suppose there is a dir called "1" when i'm in it and i use "mv ../1
../44" command for example, mv does the job. but nor pwd or shell prompt
does not show the change until i go back to the parent of "1" directory.

Repeat-By:
    it happens every time.

Fix:
    i don't know about the source code at all, but if "pwd" or shell prompt
get their information more interactively from the file system, the bug
should be gone.

-- 
Sincerely
A. Ghanavatian