Sub-ticket support

[SimonLei]

When a new ticket created, the user can assign the new ticket a parent ticket. It's very useful in project management. For example, when I have a feature to be implemented, I submit a ticket in the trac. Then, I found there are 3 tasks to implement the feature, and each task can be broken down into 6 subtask. It's very clear to know how much subtask is complement, and how long should we finish the feature.

[Christian Boos]

That would be the parent/child relationship described in #886.

Let's keep this ticket open to discuss UI/implementation details of this particular feature.

Instead of assigning an arbitrary parent to a New Ticket, I think it would be more convenient to have a Create Sub-ticket button in a Relations section. That section would be located below the ticket description, and above the Attachments section.

Clicking on the Create Sub-ticket button would create a new ticket:

• with a <<child-of>> relationship to its parent
• with most of the fields pre-filled according to the values of the parent; they won't necesseraly be kept, but it would be a good start

[Christopher Lenz]

cboos, I don't see the need to fragment the discussion on tickets. This is a duplicate of #886, so let's close this and take any discussion there.

We have way to many open tickets already, and spreading similar/same requests across multiple tickets can't be a good idea.

[Christian Boos]

I don't see the need to fragment the discussion on tickets.

…maybe for having a sub-ticket of a bigger ticket in order to keep the discussion focused on a particular detail of the parent ticket?

From this perspective:

• #31 is the main ticket (ticket dependencies in general),
• #886 is a sub-ticket of #31 (focusing on parent/child relationships)
• this one is a sub-ticket of #886, discussing the UI for creating a sub-ticket (maybe I should have changed the summary)