bug#22694: 25.0.91; dired-mark-files-containing-regexp read file disk

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 16 Feb 2016 21:47:28 +0900 (JST)
> From: Tino Calancha <f92capac@gmail.com>
> 
> When a buffer visiting the file on disk exists, the matching is performed 
> on this buffer: if the buffer is out of sync with the file, the
> result may be wrong.
> 
> emacs -Q /tmp/foo --eval='(progn (with-current-buffer "foo" (insert "baz")) (save-buffer))'
> C-x d RET
> M-! printf baz >> bar; for f in foo bar; do printf qux >> $f ; done RET
> g
> % g \`bazqux$ RET
> ;; Just match bar.  It may signal an error if trying to read a non regular file.
> 
> 
> *) Files satisfying predicate `file-regular-p'.
> *) A buffer visiting the file on disk need to be updated before matching the input regexp.

Isn't this by design?  Dired doesn't by default re-sync with the disk;
if you don't like this, you can turn on auto-revert in the Dired
buffer.