bug#34915: 27.0.50; Wdired regression with ls -F

[Ken Brown]

The fix for this bug causes wdired-tests to hang on my system (Cygwin):

$ make -C test wdired-tests
make: Entering directory '/home/kbrown/src/emacs/i686/test'
make[1]: Entering directory '/home/kbrown/src/emacs/i686/test'
   GEN      lisp/wdired-tests.log
Running 5 tests (2019-05-30 15:39:07-0400, selector `(not (tag :unstable))')
Press C-c C-c when finished or C-c ESC to abort changes
Move: 1 of 1
Move: 1 file done
    passed  1/5  wdired-test-bug32173-01 (0.189231 sec)
Press C-c C-c when finished or C-c ESC to abort changes
    passed  2/5  wdired-test-bug32173-02 (0.140659 sec)
(Shell command succeeded with no output)
Connection file "/tmp/emacs197609/server" deleted
Press C-c C-c when finished or C-c ESC to abort changes
Connection file "/tmp/emacs197609/server" deleted

[At this point I kill it with C-c.]

I don't use wdired, so I haven't made a serious effort to track down the cause. 
I thought at first that it might have something to do with the following alias 
that I use:

alias ls='ls -F --color=tty'

But the problem persisted after I moved my .bashrc out of the way.

Ken