[REF] mail: separate button rendering
[REF] mail: separate button rendering

original PR: https://github.com/odoo/odoo/pull/25801

closes odoo/odoo#38141

Signed-off-by: Alexandre Kühn (aku) <22220c18caede9806cb42c8e2b41136d711673bf@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo