The new approach is a script named ERP5Site_getWorkflowStateItemList that receives the portal type and the state variable (simulation_state/validation_state) as parameters and it will returns the states for the workflow chained to the portal type. This way all the standard dialogs works out of the box even if you customize a workflow chain

before, user's input is completely ignored and calculated good values
are automatically set. and the commit fc54fbaa somehow tried to
respect user's source input, but it caused worse result for incoming
case. so this commit reverts fc54fbaa and set source and destination
just as user's input if not empty.

Avoid getting the list twice, follow coding style, explicitly access portal
methods on portal.

Remove condition to test if the event path destination predicate applies for this destination. On this this case, we can trust on the previous selection using the domain

Because edit adds a line in workflow_history

This tab will also display outcome and expense paths

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

Add follow_up parameter on Base_addEvent script to be possible pass the follow up when the context is a person or organisation

Fix the base_category field on Campaign_viewEventPath to set the relation correctly and refactor Ticket_countDefaultEventPathDestinationList and Ticket_createEventFromDefaultEventPath to not display exception when the Domain is not set

Refactor code to get domain directly instead of restrictedTraverse and remove base domain id hardcoded