GtkFileChooserEntry: move the cursor after the user chooses a completion from the list

https://bugzilla.gnome.org/show_bug.cgi?id=756450

gtk/gtkfilechooserentry.c

@@ -277,6 +277,8 @@ match_selected_callback (GtkEntryCompletion  *completion,
                             -1,
                             &pos);
 
+  gtk_editable_set_position (GTK_EDITABLE (chooser_entry), pos);
+
   g_free (path);
 
   return TRUE;