It is sometimes desirable to completely remove a field from the automated tracking message when setting a custom message that already covers the change being made. Add a filtering method on threads to allow models to selectively hide tracking values from emails and messages. task-2974500 closes odoo/odoo#109606 Related: odoo/enterprise#31795 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>