Before this commit: When a new conversation is initiated, the 'new messages' separator is displayed. This looks a bit weird as there is no history of conversation and thus no older messages from which new messages should be separated. After this commit: The 'new messages' separator will not be displayed in new conversations. LINKS PR https://github.com/odoo/odoo/pull/65952 Task-2453511 closes odoo/odoo#66400 X-original-commit: ff44dbf31a3732a8ebced7ff907fff3b2440afc4 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>