This commit removes the "new message" separator when posting a
message on a channel.
At the same time, this commit solves an issue that caused messages
to flicker when the message came from the bus before the answer of
the rpc.
In order to do so:
- messages are marked as read immediately after
`message_post` for the member of user that posted it.
- a temporary id is passed to `message_post` in order
to reconcialiate temporary/server messages.
task-3232911
closesodoo/odoo#116085
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
tsm-odoo
55f06fd5aa