Increase image-dired-show-all-from-dir-max-files to 500

* lisp/image-dired.el (image-dired-show-all-from-dir-max-files):
Increase default to 500 to ask for confirmation much less frequently.
The old value was added before we had asynchronous generation of
thumbnails, when a large number of files would lock up Emacs.  Asking
for confirmation could probably be disabled completely these days, but
let's be conservative and set it to some large number of files for
which some users might want to see a prompt.  It can't hurt.
(image-dired-show-all-from-dir): Never warn if above variable is nil.
(image-dired-bookmark-jump): Let-bind above variable to nil instead of
'most-positive-fixnum'.
* doc/emacs/dired.texi (Image-Dired): Don't mention the above
variable, as it is no longer important enough to deserve the space.
* etc/NEWS: Announce the above change.

1 files changed, 1 insertions, 2 deletions

diff --git a/doc/emacs/dired.texi b/doc/emacs/dired.texi
index 9cdd4b805e6..387ccdf4a57 100644
--- a/doc/emacs/dired.texi
+++ b/doc/emacs/dired.texi
@@ -1509,8 +1509,7 @@ image-dired}.  This prompts for a directory; specify one that has
 image files.  This creates thumbnails for all the images in that
 directory, and displays them all in the thumbnail buffer.  The
 thumbnails are generated in the background and are loaded as they
-become available.  This command asks for confirmation if the number of
-image files exceeds @code{image-dired-show-all-from-dir-max-files}.
+become available.
 
   With point in the thumbnail buffer, you can type @key{RET}
 (@code{image-dired-display-thumbnail-original-image}) to display a