addons/mail/models/ir_action_act_window.py


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# -*- coding: utf-8 -*-
from odoo import fields, models


class ActWindowView(models.Model):
    _inherit = 'ir.actions.act_window.view'

    view_mode = fields.Selection(selection_add=[
        ('activity', 'Activity')
    ], ondelete={'activity': 'cascade'})