Steps to reproduce: 

1. User A opens a ticket and starts editing the description, saves the changes.
2. User B also enters the ticket description and start editing it. He/she leaves the description field but without saving the changes. 
3. User A goes in the ticket again and starts editing his/her description. Then saves the changes

Observed result: the changes of User B are overwritten. 

Of course, you find the changes in the history. But transferring this into the description is very time consuming and annoying. It would be really great to have a better process to prevent this overwriting process (e.g. not being able to leave the field without saving/not saving or informing the users that a different user also edits the description at the moment).