Make Backlog lane only show tickets that have not been assigned to any board
Problem to solve
Backlog column shows different items across boards within the same group/project, it currently shows any ticket not placed on the currently viewed board.
Further details
Because it's not possible to collapse lanes we had to create a multi board workflow, the problem is that tickets shuyld enter the workflow from the backlog but backlog currently shows tickets that are already assigned to other boards within the group/project.
Proposal
Backlog to only show tickets that are not assigned to any list/swimlane.
What does success look like, and how can we measure that?
Backlog only shows items not assigned to lists across all boards
Links / references
https://gitlab.com/gitlab-org/gitlab-ce/issues/37747 https://gitlab.com/gitlab-org/gitlab-ce/issues/40630