file-name-shadow-mode

file-name-shadow-mode is a variable defined in `rfn-eshadow.el'.
Its value is

t

Documentation:
Non-nil if File-Name-Shadow mode is enabled.
See the command `file-name-shadow-mode' for a description of this minor mode.
Setting this variable directly does not take effect;
either customize it (see the info node `Easy Customization')
or call the function `file-name-shadow-mode'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.