DeliveryLine_init sets a incremental reference for each delivery line, so this
reference cannot be used for searching

A set setter keeps the default value, so in a sense the order is preserved.

Ideally the signature of accessor should be more strict

Also, factorise & simplify code.
Also, follow coding style.
Also, follow naming conventions.
Also, avoid calling dict() for static key sets.
Also, add comments about bad code kept for backward compatibility.
Also, add comments about incorrect grammar - also kept for backward
compatibility.

Add constraints to EventConstraint property_sheet to check if destination, resource and source are set and move TALES constraint to a new property sheet that is specific to Mail Messages. By default both are not enabled.

Add property sheet to check if the event destination have email address defined. By default, this constraint is disabled

This way if we select a notification message we can leave the title empty and use the title from notification message (which supports substitution)

Fix jump to filter by follow up instead of hardcoded portal type beucase on this case can exists different portal type to the Campaign

Change test add one critetion to filter by validation_state instead of use reference hardcoded. Also, the test predicate returns False when this criterion does not match

Hide action to create Event Path on Campaign object. The sub object should be created automatically through the event path tab when edited