Ambiguous branchs/tags are not handled well in network graph, browser and editor
if you have both, a branch and a tag named exactly the same, gitLab mostly shows the branch information. e.g. while https://gitlab.com/gitlab-org/gitlab-ce/branches for branch AMBIGNAME links to https://gitlab.com/gitlab-org/gitlab-ce/tree/AMBIGNAME and https://gitlab.com/gitlab-org/gitlab-ce/tags for tag AMBIGNAME links to https://gitlab.com/gitlab-org/gitlab-ce/AMBIGNAME
the network branch / tag selection will both go to https://gitlab.com/gitlab-org/gitlab-ce/network/AMBIGNAME for branch AMBIGNAME AND tag AMBIGNAME