Is there a possibility to unset the assignee field when showing a transition screen?
Unassigned issues are not allowed in our JIRA instance.
When requesting feedback I often forget to also set the new assignee, which requires another edit of the issue and so another email. This is annoying so I want to force me and all other users to choose the assignee. Setting the assignee element to an invalid state would solve the issue.
Post-transition is AFAIK no solution.
You can't. You've turned off the ability to have unassigned issues, so there will always be an assignee.
The best you could do is in a workflow validator that can detect when a user does not change the assignee on a transition and blocks them from continuing until they've done it.
I'd really not do it that way.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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