Group permissions do not allow project moves between namespaces

Summary

When trying to transfer a project from Namespace B to Namespace A permissions are not enforced consistently. Members of a namespace with Owner permissions via a Group cannot transfer a project into that namespace. This appears to be inconsistent, as a member of a Namespace with Owner permissions can give themselves a direct Owner role, which allows the migration to be performed.

Steps to reproduce

• Create two namespaces: Namespace A and Namespace B
• In Namespace A give a second user Owner access
• In Namespace B give Namespace A Owner access
• Create a project in Namespace A
• Have the second user try to move the project from Namespace A to Namespace B.

Example Project

https://gitlab.com/project-migration-test2/move_this

https://gitlab.com/project-migration-test2

https://gitlab.com/project-migration-test

What is the current bug behavior?

Can't migrate a project with apparently correct permissions

What is the expected correct behavior?

Should be able to migrate projects both ways.

Relevant logs and/or screenshots

N/A

Output of checks

N/A

Results of GitLab environment info

Reproduced on Gitlab.com

GitLab Enterprise Edition 13.8.0-pre f3039f5f

Possible fixes