Link to a closed element

Hi Babynus,

I feel it would be nice to be able to add a link to an element (e.g. Ticket) which is closed. For me, it is useful in the following use case:

I have a new ticket, which is similar to a problem that was solved some time ago. That old ticket is now closed, but it would be interesting for the developer who has to solve the latest problem to see what was done to solve the old issue.

Thanks!