[FIX]tree view top/bottom editable issue.
[FIX]tree view top/bottom editable issue.

havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web