[nautilus: 1/2] window-slot-dnd: fix drop condition check

[Carlos Soriano <csoriano src gnome org>]

commit 0a7b7977e59a7b2c062e0b18a9cab928ece28976
Author: Alexandru Pandelea <alexandru pandelea gmail com>
Date:   Fri Dec 22 23:41:20 2017 +0200

    window-slot-dnd: fix drop condition check
    
    Drag and dropping on a search or starred location tab gives an error dialog
    that says "Error while copying to /".
    
    In order to be able to drop the selection on a target it is also necessary
    to check whether it is editable, property which is set False for the Star
    and Search directories.
    
    https://gitlab.gnome.org/GNOME/nautilus/issues/168

 src/nautilus-window-slot-dnd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-window-slot-dnd.c b/src/nautilus-window-slot-dnd.c
index b8dd87a07..dede5dc1f 100644
--- a/src/nautilus-window-slot-dnd.c
+++ b/src/nautilus-window-slot-dnd.c
@@ -220,9 +220,12 @@ slot_proxy_drag_motion (GtkWidget      *widget,
     if (target_uri != NULL)
     {
         NautilusFile *file;
+        NautilusDirectory *directory;
         gboolean can;
         file = nautilus_file_get_existing_by_uri (target_uri);
-        can = nautilus_file_can_write (file);
+        directory = nautilus_directory_get_for_file (file);
+        can = nautilus_file_can_write (file) && nautilus_directory_is_editable (directory);
+        nautilus_directory_unref (directory);
         g_object_unref (file);
         if (!can)
         {