With this commit, when using autocomplete inputs in Discuss
or chat windows, the 1st item is automatically auto-focused.
Example of autocomplete inputs:
- Discuss: "Add or join a channel" in sidebar
- Chat window: when clicking on "New Message" from systray
messaging menu.
As a result, we can use keyboard keys to navigate and select
the desired item.
Task-ID 1894447
closes odoo/odoo#30207