Ticket #14708: set-role.diff

capabilities.php

@@ -604 +604 @@
         function set_role( $role ) {
                 foreach ( (array) $this->roles as $oldrole )
                         unset( $this->caps[$oldrole] );
+
+                if ( 1 == count( $this->roles ) && $role == $this->roles[0] )
+                        return;
+
                 if ( !empty( $role ) ) {
                         $this->caps[$role] = true;
                         $this->roles = array( $role => true );