Fix #1703: blank dired over TRAMP

When the remote system does not have GNU ls installed.

modules/emacs/dired/config.el

@@ -30,6 +30,19 @@
         (setq args (delete "--group-directories-first" args))))
     (setq dired-listing-switches (string-join args " ")))
 
+  (add-hook! 'dired-mode-hook
+    (defun +dired-disable-gnu-ls-flags-in-tramp-buffers-h ()
+  "Fix #1703: opening directories over TRAMP in dired displays a blank screen.
+
+This is because there's no guarantee the remote system has GNU ls, which is the
+only variant that supports --group-directories-first."
+      (when (file-remote-p default-directory)
+        (setq-local dired-listing-switches
+                    (string-join
+                     (split-string dired-listing-switches
+                                   "--group-directories-first")
+                     " ")))))
+
   (define-key! dired-mode-map
     ;; Kill buffer when quitting dired buffers
     [remap quit-window] (λ! (quit-window t))