Make dired-default-directory obsolete.
As far as I can tell, it was never used outside of dired-smart-shell-command. It doesn't seem worth keeping around as a separate function. * lisp/dired-x.el (dired-default-directory-alist, dired-default-directory): Mark as obsolete. (dired-smart-shell-command): Just call dired-current-directory. * doc/misc/dired-x.texi (Multiple Dired Directories): Remove mentions of dired-default-directory-alist and dired-default-directory. Move dired-smart-shell-command here... (Miscellaneous Commands): ... from here.
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