[FIX] web: proper x2m edition with pagination

Before this commit, we did not really handle gracefully editing a
one2many with many records. The main issue is that if the user was not
on the last page, creating a new record added it to the last page, which
is confusing and actually a bad idea for records with required fields.

This fix requires a way to track the current changes (because we do not
display the current state of the form view: the new record is displayed
in the first page, but is actually added at the end of the dataset).

Note that this probably does not solve all issues with pagination. This
is a quite delicate problem. We will add tests and fixes as needed.

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