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bug#7112: 24.0.50; [PATCH] `ls-lisp-insert-directory' should be no-op fo

From: Drew Adams
Subject: bug#7112: 24.0.50; [PATCH] `ls-lisp-insert-directory' should be no-op for empty FILE
Date: Sun, 26 Sep 2010 17:21:58 -0700

You can call `dired' passing a cons arg that includes a list of file
names.  An empty file name causes this ugly error: 
(error "Args out of range: \"\", -1")
The reason is the following code near the end of
;; If not full-directory-p, FILE *must not* end in /, as
;; file-attributes will not recognize a symlink to a directory,
;; so must make it a relative filename as ls does:
(if (file-name-absolute-p file) (setq file (expand-file-name file)))
(if (eq (aref file (1- (length file))) ?/)
    (setq file (substring file 0 -1)))
`ls-lisp-insert-directory' should in fact do nothing at all (no-op) if
FILE is "".  The entire body should be wrapped in this:
(when (> (length file) 0)
In GNU Emacs (i386-mingw-nt5.1.2600)
 of 2010-09-20 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags

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