Even if I could not reproduce the fault by copying a file from 
normal_user_nautilus's window to root_user_nautilus's window and then changing 
ownership of the copied file (and the directory where it resides) with 'chown 
-R user:user Dir', I got some (interesting?) error messages from the 
root_user_nautilus:
{
#### XSu-6185. BEGIN.
XSu-6185.CmdLine: >XSu DefaultFileSystemBrowser /<
XSu-6185: (nautilus:6260): GnomeUI-WARNING **: While connecting to session 
manager:
XSu-6185: Authentication Rejected, reason : None of the authentication 
protocols specified are supported and host-based authentication failed.
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_get_value: 
assertion `VALID_ITER (iter, tree_model_sort)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_object_set_property: 
assertion `G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_value_unset: assertion 
`G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_get_value: 
assertion `VALID_ITER (iter, tree_model_sort)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_object_set_property: 
assertion `G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_value_unset: assertion 
`G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_get_value: 
assertion `VALID_ITER (iter, tree_model_sort)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_object_set_property: 
assertion `G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_value_unset: assertion 
`G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_get_value: 
assertion `VALID_ITER (iter, tree_model_sort)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_object_set_property: 
assertion `G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_value_unset: assertion 
`G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_get_value: 
assertion `VALID_ITER (iter, tree_model_sort)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_object_set_property: 
assertion `G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): GLib-GObject-CRITICAL **: g_value_unset: assertion 
`G_IS_VALUE (value)' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: gtk_tree_model_sort_iter_next: 
assertion `tree_model_sort->stamp == iter->stamp' failed
XSu-6185: (nautilus:6260): Gtk-CRITICAL **: file 
/build/buildd/gtk+2.0-2.12.0/gtk/gtktreeview.c: line 5928 
(validate_visible_area): assertion `has_next' failed.
XSu-6185: There is a disparity between the internal view of the GtkTreeView,
XSu-6185: and the GtkTreeModel.  This generally means that the model has changed
XSu-6185: without letting the view know.  Any display from now on is likely to
XSu-6185: be incorrect.
XSu-6185: (nautilus:6260): Eel-WARNING **: "nautilus-metafile.c: metafiles" 
hash table still has 3 elements at quit time (keys above)
XSu-6185: (nautilus:6260): Eel-WARNING **: "nautilus-directory.c: directories" 
hash table still has 3 elements at quit time (keys above)
#### XSu-6185. END.
}
The above is an extract of .xsession-errors after I tried the 
copying/changing_ownership trick several times. I have edited out any lines not 
coming from the XSu instance which launched the root_user_nautilus.

By the way, when I changed ownership nautilus did not show the change
(once I waited a couple of minutes) in the listing of files (List view).
I had to click 'reload' to have nautilus show it right.

Saludos,
Manolo.

-- 
[Gutsy] high processor activity after logging out and then logging in again
https://bugs.launchpad.net/bugs/150471
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