uniquify-list-buffers-directory-modes

uniquify-list-buffers-directory-modes is a variable defined in `uniquify.el'.
Its value is

(dired-mode cvs-mode vc-dir-mode)

Documentation:
List of modes for which uniquify should obey `list-buffers-directory'.
That means that when `buffer-file-name' is set to nil, `list-buffers-directory'
contains the name of the directory which the buffer is visiting.