This is currently highly faillible as saving a form or a list view can be an async operation, yet the FormView's `Widget#get_value` call can only be synchronous. As a result, there are cases where saving a form view can fail to get the correct value for its o2m fields. Ideally, `Widget#get_value` should be an async API (or a sync/async API) bzr revid: xmo@openerp.com-20111205153813-nvgy5413oyf5zsla