Provide additional default values (file name at point or at the
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'.
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