Add option to use Assignees as a filter option, instead of just assignee_member
After spending a while banging my head against the wall, I realized that the assignee_member
function only checks the assignee property of the issue, which means my current filters are based in the assumption that the property is comparing the list of assignees on issue, and will not work.
Gitlab documentation correctly points out that the assignee property is officially deprecated, so having a main feature based on a deprecated property, and not clearly documenting it is very unclear based on the current documentation