Purpose: -------- In the full-width form view of mailing, the alert-info message was not displayed correctly: it did not fill the whole empty space in the header This message is now always filling the gap between the buttons and the status widget of the header. Task-3010933 closes odoo/odoo#104868 X-original-commit: f216b7e6cf607e18fd54655aca1a0df5a951ce76 Signed-off-by: Stéphane Debauche (std) <std@odoo.com>