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Changes between Initial Version and Version 1 of Ticket #12414, comment 11

initial	v1
3	3
4	4	You can append to the comment in `ITicketManipulator.validate_ticket`, and update the PR in `ITicketChangeListener.{ticket_created/ticket_changed/ticket_comment_modified}`, or update the PR in `ITicketManipulator.apply_ticket_side_effects` if you need access to the `req` to get the PR id?
	5
	6	`ITicketManipulator.validate_ticket` is primarily document as being for identifying problems and rejecting changes, but it's location in the request processing makes it very useful for modifying the ticket changes.
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	8	I think it's been discussed before, `ITicketChangeListener` might be more useful if the request was passed as an argument. One way would be to move the call to `ITicketChangeListener` out of the model object. Also, it might be more user friendly if ticket changes were passed in a dict that included the `cnum` and `cdate`, rather than passing the `ticket` and `old_values`.