Sorting preference functionality has been extracted
from `IssuableCollections` to a new `SortingPreference`
concern in order to reuse this functionality in projects
(and groups in the future).
Count issues related merge requests based on user access level. And
issue can have related MRs from projects where user does not have
access so the number of related merge requests should be adjusted
based on user's ability to access the related MRs.
https://gitlab.com/gitlab-org/gitlab-ce/issues/59581
In order to let users' sorting preferences transfer between devices, we
save the preference for issues and MRs (one preference for issues, one
for MRs) in the backend inside the UserPreference object
GitLab Bot