revision information lost when renaming directory

[Roland Winkler]

In GNU Emacs 21.1.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-02-01 on tfkp12
configured using `configure  --prefix=/nfs/common --libexecdir=/nfs/common/lib 
--bindir=/nfs/common/lib/emacs/21.1/bin/i686-Linux 
--mandir=/nfs/common/share/man --infodir=/nfs/common/share/info --with-gcc 
--with-pop --with-x --with-x-toolkit=athena i386-pc-linux'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  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
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

(1) Suppose file bar in directory foo is under version control,
    i.e., I have a file foo/bar/RCS/bar,v.
    So when editing file bar, the modeline of the buffer visiting bar
    displays the version number.

(2) When I use dired to rename the directory foo while I am editing
    bar, this will correctly update the default-directory for bar.
    However, the modeline does not display anymore that bar is under
    version control.

Am I asking here too much from dired? Certainly, that's why I prefer to
rename directories using dired because usually dired will
automatically update everything that is affected by such a change.

I haven't figured out yet, to what extent emacs' version control
functions will be fooled after I have renamed the parent directory.

Roland