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current Dired line) via M-n for file reading minibuffers.  (Bug#5010)

* minibuffer.el (read-file-name-defaults): New function.
(read-file-name): Reset `minibuffer-default' to nil when
it duplicates initial input `insdef'.
Bind `minibuffer-default-add-function' to lambda that
calls `read-file-name-defaults' in `minibuffer-selected-window'.
(minibuffer-insert-file-name-at-point): New command.

* files.el (file-name-at-point-functions): New defcustom.
(find-file-default): Remove defvar.
(find-file-read-args): Don't use `find-file-default'.
Move `minibuffer-with-setup-hook' that sets `minibuffer-default'
to `read-file-name'.
(find-file-literally): Use `read-file-name' with
`confirm-nonexistent-file-or-buffer'.

* ffap.el (ffap-guess-file-name-at-point): New autoloaded function.

* dired.el (dired-read-dir-and-switches):
Move `minibuffer-with-setup-hook' that sets `minibuffer-default'
to `read-file-name'.
(dired-file-name-at-point): New function.
(dired-mode): Add hook `dired-file-name-at-point' to
`file-name-at-point-functions'.