[nautilus] dnd: Only allow drop to writable directory

[António Fernandes <antoniof src gnome org>]

commit 1910f670593e83f456b6f0330aff816b8e7ce5ef
Author: Corey Berla <corey berla me>
Date:   Sun Jul 3 13:27:37 2022 -0700

    dnd: Only allow drop to writable directory

 src/nautilus-dnd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-dnd.c b/src/nautilus-dnd.c
index d13136946..3bdf1f68b 100644
--- a/src/nautilus-dnd.c
+++ b/src/nautilus-dnd.c
@@ -172,7 +172,8 @@ nautilus_dnd_get_preferred_action (NautilusFile *target_file,
     {
         return GDK_ACTION_COPY;
     }
-    else if (!nautilus_file_is_directory (target_file))
+    else if (!nautilus_file_is_directory (target_file) ||
+             !nautilus_file_can_write (target_file))
     {
         /* No other file type other than archives and directories currently
          * accepts drops */