Before this commit: In discuss, the group DM default name does not contain any guest names in it. After this commit: Group DM default name will also take guest names along with other user names. Task-2664859 closes odoo/odoo#86130 X-original-commit: 41f4c5741097b09c372406bbbd5364314bff6d1b Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>