reverted deferred ordering and put in safety check for managed handlers
reverted deferred ordering and put in safety check for managed handlers

GerHobbelt/backbone.layoutmanager,huang-x-h/backbone.layoutmanager,SimenB/backbone.layoutmanager,tbranyen/backbone.layoutmanager,huang-x-h/backbone.layoutmanager,tbranyen/backbone.layoutmanager,SimenB/backbone.layoutmanager