From a (e.g.) list view, click on "Create". In the form view, fill
in some fields, but leave a required field empty. Click on the
breadcrumbs to come back to the list. Before this commit, a
notification was displayed (because some required fields are
unset), but we left the form to come back to the list anyway.
The desired behavior is to stay on the form view, and display a
notification indicating that some fields are invalid.
In legacy views, we rejected promises to indicate that we couldn't
leave. This is a pattern we tried not to use anymore in new code.
Instead, we return a promise (if the method is async obviously)
which resolves to a boolean value, indicating if it works or not.
As a consequence, the action service wasn't properly dealing with
new views, as the promises they return always resolve.
This commit fixes the issue by adapting the code in the action
service.
Part-of: odoo/odoo#100050
Aaron Bohy
8f58b1c768