Allow to merge tickets

[marien-probesys]

Problem

Sometimes, a new ticket is created when a user answers to an email because he doesn't have the authorization on the initial ticket. However, after giving them the correct authorization, there are still two tickets. Agents can close the second ticket, but they have to copy/paste the content of the answer and communicate to the user that there was an issue.

Solution

Allow to merge the second ticket with the initial ticket.

Specifications (not finished)

Add a new permission orga:merge:tickets to the agent role.

Add a new action "Merge the ticket with another" to the ticket, between "Edit the status" and "Transfer the ticket". It must open a modal containing the following form.

Create a form App\Form\Ticket\MergeForm:

• it takes a ticket as an option
• it contains a field to list the tickets of the ticket's organization, limited by the authorizations of the current user

Create a controller App\Controller\Tickets\MergersController::new():

1. initialize the form, and gets the selected ticket to be the source of the merger
2. gets all the messages and spent time of the ticket to be merged, and copy them to the source ticket
3. close the initial ticket