This PR has 3 parts:
The members fix itself, which is necessary for performance reasons especially
at init messaging, as per described in the task.
Adding the partner name in the typing payload, because due to not knowing all
members anymore, it is necessary to properly display who is typing.
Restrict restoring scroll position only if the corresponding scroll height is
available, to make the scroll feature and particularly the corresponding tests
more robust.
task-2360020
closesodoo/odoo#60616
X-original-commit: 91ce61ba568d83190e7ed2c168fd56101474683b
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>