`find-lisp.el' is an old file that doesn't seem to have gotten much
love.  It's apparently been updated just to change things like use of
(set (make-local-variable...)) to (setq-local...).

(I wasn't aware of this library till I saw a blog post by Micky Petersen:
https://www.masteringemacs.org/article/working-multiple-files-dired.)

The attached patch fixes a few bugs that prevent using it in some
important ways: (1) opening a Dired buffer that explicitly lists its
listed files or dirs (i.e. a snapshot Dired buffer, where DIRNAME is a
cons), (2) using its listing with a `dired-actual-switches' value that
contains switch `F', (3) properly handling a listed file or dir name
that starts with a space char.

[#1 is an important use case.  Because a `find' command (Lisp or not)
can take quite a while, it can be useful to make a snapshot of its
result, i.e., save the list of files and later restore a Dired buffer
for that explicit set of files, without rerunning `find'.  For that use
case, at least, these bugs need to be fixed.]

The patch does the following.  1-2 are improvements, 3-4 are bug fixes.

1. Add other-window versions of commands `find-lisp-find-dired' and
   `find-lisp-find-dired-subdirectories'.

   (Really, both command names should be shortened.  Really, most names
   in this library should be shortened/improved.  And really, the name
   `find-lisp-find-dired' is not good - besides a confusing combination
   of name components, it doesn't tell you that it's only about files,
   not files and dirs - its companion for listing only subdirs has that
   in its name.)

2. `find-lisp-find-dired-internal': Added optional arg OTHER-WINDOW.

3. `find-lisp-find-dired-insert-file':

   * Add a doc string.
   * Put text property `dired-filename' on the inserted file/dir name.
     (This fixes the mistreatment of file/dir names that start with a
     space char.)
   * Start with `dired-actual-switches', instead of just "".  In
     particular, this is to keep switch `F'.

4. `find-lisp-format': If `F' listing switch is present then append `/'
   to listed directories.

Attached is a patch against master today.

Other changes could also be made, both to clean up the code and to
improve the behavior.  But that will wait for someone else.



In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor `Microsoft Corp.', version 10.0.19044
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''