bug#48659: Escapes are deleted after executing "dired-toggle-read-only" in *Find* buffer

[Rodrigo Morales]

* The context

By default, when executing =find-dired=, spaces are escaped (see below)

#+BEGIN_EXAMPLE
  /home/thisisme/e/:
  find . \( -type f \) -ls
   29754046      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
a/bar\ bar.txt
   29753703      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
a/foo\ foo.txt
   29754079      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
b/bar\ bar.txt
   29754078      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
b/foo\ foo.txt
  
  find finished at Tue May 25 15:25:42
#+END_EXAMPLE

This happens because that's the default behavior of =find= when we
execute it in the command-line.

#+begin_src bash
find . \( -type f \) -ls
#+end_src

#+RESULTS:
#+begin_example
 29754078      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
./b/foo\ foo.txt
 29754079      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
./b/bar\ bar.txt
 29753703      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
./a/foo\ foo.txt
 29754046      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:25 
./a/bar\ bar.txt
#+end_example

* The issue

This is causing =dired-toggle-read-only= to remove spaces after
finishing editing the buffer. I would consider this a bug, but let me
explain this further so that we all can determine whether this is a bug
or not.

* Minimal reproducible example

Let's suppose we have this directory

#+begin_src bash
mkdir {a,b} && touch {a,b}/{foo\ foo,bar\ bar}.txt
#+end_src

#+begin_src bash
tree -a --noreport
#+end_src

#+RESULTS:
#+begin_example
.
├── a
│   ├── bar bar.txt
│   └── foo foo.txt
└── b
    ├── bar bar.txt
    └── foo foo.txt
#+end_example

Let's execute =find-dired= and let's list the files (i.e. =-type
f=). The buffer =*Find*= would show the following

#+begin_example
  /home/thisisme/e/:
  find . \( -type f \) -ls
   29754046      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:30 
a/bar\ bar.txt
   29753703      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:30 
a/foo\ foo.txt
   29754079      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:30 
b/bar\ bar.txt
   29754078      0 -rw-r--r--   1 thisisme thisisme        0 May 25 15:30 
b/foo\ foo.txt
  
  find finished at Tue May 25 15:30:49
#+end_example

Now, let's toggle a =dired-toggle-read-only= and edit any name (I
appended =test= after the =a/barbar.txt= file).

Now, see what =tree= reports.

#+begin_src bash
tree -a --noreport
#+end_src

#+RESULTS:
#+begin_example
.
├── a
│   ├── barbar.txt-test
│   └── foofoo.txt
└── b
    ├── barbar.txt
    └── foofoo.txt
#+end_example

As you could see, spaces were removed from filenames and I think that
this happens because =find-file= show spaces as escaped characters.