Branches are only sortable with push permission

Summary

Without permission to push, the dropdown menu for sorting branches is missing.

Steps to reproduce

Open Branches page of public project without being logged in.

Expected behavior

Display dropdown menu for sort order as for users with push permission:

Screenshots

Current behavior without push permission:

Possible fixes

It looks like, this is fixed in the yet unmerged https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4179/diffs#a2e99e1cb20a8f29c74bbe668420902371db185b_10_7.

~"bug"