Add a set_owner_to_component_owner workflow operation

[Ryan J Ollos]

As described in comment:53:ticket:2045, it would be good to move out of the model the behavior tags/trac-1.0.2/trac/ticket/model.py@:286-303#L260​ of changing the component of a ticket in the new state. The behavior can be moved to the ticket workflow. To preserve the existing behavior we'll need to modify the workflow in an upgrade step to support the following transition:

leave_new = new -> new
leave_new.label = leave
leave_new.default = 1
leave_new.operations = leave_status, set_owner_to_component_owner

Another way to accomplish this might be to allow the <component_owner> to be used in the set_owner attribute.

Either way, we'll need to decide whether the behavior should be described in the workflow action hint, or whether it should be silent. If we decide it should be silently applied, that will drive the need for a workflow configuration attribute to configure the operation as a silent one.

[Ryan J Ollos]

TODO revisit aim described in comment:60:ticket:2045 after this ticket and #11856 are implemented.

[Ryan J Ollos]

Narrowing focus for 1.1.4.

[Ryan J Ollos]

Milestone renamed

[Ryan J Ollos]

There's a practical issue in addition to the design issue. When changing the component owner on a new ticket, the new owner is not shown as a ticket property change when previewing the ticket changes.

The implementation of set_owner_to_component_owner has not gone as well as planned, so as an incremental improvement that solves the preview issue, I proposed the changes in: log:rjollos.git:t11858_set_owner_to_component_owner.

Another feature of the proposed change is that the set_owner_to_component_owner behavior could be eliminated by replacing ConfigurableTicketWorkflow. That's not a trivial task, but it's at least practical, while replacing trac.ticket.model.Ticket could only be done with monkey-patching.

[Ryan J Ollos]

Committed to trunk in [14209].