This commit fixes few views related to mass mailing for ensuring their
proper behavior. The changes are listed as below:
- in the mass mailing form view (view_mail_mass_mailing_form), made the
mailing_type field readonly if the mailing is not in draft state to
prevent switching the type once mailing is launched.
- in the mass mailing sms form view (mailing_mailing_view_form_sms), made the
'body_plaintext' field readonly if the mailing is in sent/done state to
prevent sms content modification after the sms are already sent
Task ID-2390284
COM PR odoo/odoo#62740
ENT PR odoo/enterprise#15098closesodoo/odoo#69600
X-original-commit: 94f1994c08d3a54f6358c31634ff27532da2a569
Related: odoo/enterprise#17846
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>